All spells and dragonlord language comes from the Merlin wiki.

Chapter 10: Trouble

William couldn't believe it; of all people, Merlin was his father. He wasn't angry at all, he had truly felt comfortable and had great love for the young man who he had heard so many stories about, and shared so many secrets with. He could think of no one better to be his true father, and only felt joy that he actually had one still around. It wasn't that Eric was a bad father, but William barely remembered him; he was only a year old, after all, when Eric died. He didn't even blame his mother for keeping it a secret really; everything that happened in Brenna was not the most ideal of circumstances to be sharing such news. No…, he was more worried whether Merlin and his mother would be ok after this, and even if Merlin would want to be his father. He also didn't understand why his mother never told Merlin. It would have been so simple - he would have had a father, and Merlin would have been safe. Brenna accepted magic. William felt a sense of desperation as Merlin left angrily. William had to go after him just to make sure he still wanted to be his father. William quietly slipped out of the room, glancing back at his mother who was crumpled on the floor, sobbing and shaking. He would look after her when he got back. But first he had to get to Merlin, and so he rushed out of the room after him.
William had to run and dodge around many servants and nobles alike, without drawing too much attention to himself in case he was stopped. His tiny legs ran as fast as they could, but Merlin was too far ahead and rushing at an extremely fast pace, ignoring the looks as he pushed people out of the way in his desire to get outside the castle.
William was forced to hide behind a cart in the square as Galahad and Leon came storming past, dread and worry plastered across their faces. When it was safe to move, William raced after Merlin just in time to see his back disappearing into the tree line of the forest. William ran after him, thinking he would be able to catch up by meeting Merlin at the clearing where they practiced magic.
William became increasingly worried as he wandered around the forest, trees looming over him, closing any gaps to allow light to filter down, creating a dark and looming presence in the stillness that surrounded him. He was put out - he was sure he should have reached the clearing by now, and he had no idea which way it was to get back to Camelot. He shook his head and puffed out his chest. "Come on William, get a grip. You are a prince! Princes don't get scared; do you hear me? I am not afraid of you, forest!" He spoke out loud to the forest, his tone demanding, but failing to mask the fear in his voice and the quiver of his lip. He continued on…

Meanwhile, in a large clearing in another part of the forest, an angry warlock was pacing and throwing bolts of magic at trees as he boiled over with anger. He lifted his head and roared to the sky "O drakon, e mala soi ftengometh tesd'hup anankes! Erkheo". Merlin continued to pace; he did not have to wait long, as Kilgarrah came to land in front of his Dragonlord.
"Greetings, young warlock," the great dragon welcomed respectfully, with a bow of his head at the young man in front of him.
Merlin glared at Kilgarrah and didn't bother to control his barely contained anger. "Did you know?" Merlin yelled.
"Did I know about what?" Kilgarrah asked, puzzled.
"Did you know that my father was a king, and that his father before him was the great Ambrosia?" Merlin seethed at his companion.
"Yes Merlin, I did," replied Kilgarrah with confusion.
"Why didn't you tell me? I had a right to know!" Merlin yelled.
Kilgarrah looked at the angry young warlock with a raised eyebrow. "It was not necessary. It mattered not to your destiny. I did not believe it was important. You forget, Merlin, I am not a human; these things do not matter, nor are they important to me. The only thing that matters is that you fulfill your destiny and duty to the dragons, not the bloodline you come from. Plus, you never asked."
Merlin's shoulders slumped and he took a steading breath as he got his emotions under control. He couldn't really be that angry at the dragon. He mumbled about stupid dragons and their way with words.
"Now, Merlin, tell me: How have you come to this knowledge, and what has made you so angry? I doubt just this information would have you scorching the trees." Kilgarrah asked in a more gentle tone.
"I just found out that I have a son. A son, Kilgarrah. His mother kept it from me for five years. I'm hurt and angry; I didn't grow up with a father. I wouldn't want that for my child. How will this affect my destiny?" Merlin raged, getting his feelings off his chest.
Kilgarrah was startled about this news, but to have the line of the Dragonlords still a prospect was uplifting. He then started to laugh; the absurdity of Merlin, of all people, having a son seemed to cause him mirth. Merlin just looked on in shock as Kilgarrah laughed at him.
"I don't see what's so funny," he asked crossly, folding his arms across his chest.
"Merlin, do not worry so much. It is a great gift; you will fulfill your destiny. I just don't understand how this could have happened. When did you get the time?"
Merlin frowned "It was just after I lost Freya and Father, I went to Ealdor for a break. I was so alone and depressed about all the people I had lost and those I had killed. Cas - or you might know her as Princess Cassandra from Brenna - was visiting. She was being forced to marry someone she didn't know or love. Her father had re-married and brought a son into her home. She told me that her step mother wasn't very nice to her behind closed doors and she suspected her new brother wasn't pleased with her either. Eric had been chosen as her husband by the Queen, even though she didn't want to marry him. We were so lost, scared and alone." The memories brought sadness and a small tear escaped.
"We always had a special connection and she didn't want to be taken by some stranger. She begged me to lie with her. I was so ashamed later that I gave in; I just didn't want to be alone. I felt disgusted at myself back then that we didn't do it for love. We were just reaching out for someone and let our emotions take control of our actions, trying to make a pure connection. I felt that I betrayed Freya. We went our separate ways, remaining friends, and then she came back to Camelot. I have realized I still have feelings for her." Merlin sighed as he finished pouring out his soul. It made him feel so much better. He was still a little angry at Cassandra for keeping William's birth from him, but it was dying to a smoldering fire instead of a raging inferno.
"Merlin, you have suffered much; but you should feel privileged by this gift." Kilgarrah answered seriously.
"Thank you Kilgarrah. It just means more secrets and complication to my life. I will not deny the boy a father. I do truly love him." Merlin sighed, but a smile played around his mouth, for William had truly wormed his way into Merlin's heart.
He started on his way back to the castle feeling much more relaxed. He was still angry at Cassandra and it would take a little while before he could forgive her. He always forgave so easily, but she had really hurt his feelings this time; although those feelings that had grown over the past few weeks were still there, it would be a while before he would be willing to try again.
As Merlin reached the citadel, the flurry of activity had him on high alert. Knights were in full armor, moving in tight groups; peasants were moving around, carrying supplies in a hurry. He saw Cassandra running down the steps, but he turned away, not wanting to face her just yet. Instead he headed towards a group of knights to ask where he could find Arthur and work out what was going on. He heard Cassandra call out in desperation, but he ignored it.
"Merlin, wait, please. I know you hate me right now, but… Please, Merlin!" she begged, grabbing his arm in a vice-like grip and trying to force him to face her. "I don't care if you don't want to ever see me again, but you don't want William hurt," she sobbed.
At the mention of William's name, Merlin stopped struggling and turned to face her. Merlin saw her lip quivering, tear tracks down her cheeks from crying earlier, eyes wide, pleading. As she spoke, it was with desperation and utter brokenness. "William's missing, and Galahad and Leon informed the court that… that my step brother and an army are approaching Camelot. I just know that he knows the truth about William. Any bad feelings you have towards me, I know you don't want to see William hurt." she whispered brokenly.
Merlin was speechless; the danger to William sent panic coursing through him. He had only just learned the truth - he would not let any harm come to his son. He forgot about his anger towards Cassandra in the effort to find the little prince. "When was he last seen? How long until your step brother attacks?" Merlin asked urgently.
"William hasn't been seen all day. He ran away from Amy; she has gone searching for him, but my step brother's army will be here by dawn, if not before. I am so worried, Merlin!" Cassandra replied, panic evident in her tone.
"Come on then; no time to lose. I'm sure William is in the castle somewhere," he announced with a small smile, to reassure Cassandra and to hide the growing pit of despair in his stomach.

However, William was far from the castle and now he was truly lost. His sense of bravery was depleting, leaving a very tired and scared little boy, lost in a very large forest where nobody knew he was. The sun sank lower into the sky, indicating that it would be dark soon. He shivered slightly. He decided the best thing would be to wait until someone came looking; if he really needed to, he could try and walk home in the morning. At least I won't be cold or sitting in the dark, he thought to himself as he picked up a bunch of sticks to light a fire. He concentrated like Merlin had taught him, and pointed his hand towards the sticks. "Forbearnan!"
A satisfied smile broke out on his face as the wood caught alight. He yawned and lay down on some soft moss and closed his eyes, expecting someone would find him and take him back to Camelot by morning.
A loud snap of a dry branch awoke William a little while later, the sun now truly set. William sat up sleepily and rubbed his eyes, trying to get his bearings. A rustling in the trees alerted him to a presence. "Who's there?" He yelled strongly – well, strongly for a five year old - peering into the dark, trying to see past the shadows. Out of the trees walked Amy, a confused look on her face while her eyes moved around William's fire, trying to look for other people, "William, what are you doing here? Cassandra will be worried sick," she admonished, moving closer to the young prince.
William frowned up at his carer. There was something not quite right about her behaviour. Amy seemed annoyed but it was as if she was trying not to sneer at him. If it had been anyone else, they would have been a little angry, but so relieved and joyous at finding him. He answered her anyway. "I followed Merlin, but I got lost. Do you know how to get back to Camelot?"
"Come on, William, I will take you back to your mother." Amy replied, striding over to him and roughly grabbing his arm, pulling him to his feet and marching him away from the small fire.
It wasn't long before William became uncomfortable; the grip Amy had on him was painful and she was literally dragging him through the forest. "Ow! Amy, are we almost there? You're hurting my arm. Can we please stop?" He sulked.
"Shut your filthy little mouth, you bastard!" Amy snarled, her face twisting into a look of malice. William was speechless; he wasn't sure if he had heard right. Why was she so angry at him? Suddenly he was thrown away from his carer. He landed heavily on the ground, crying out loud as he landed awkwardly on his arm. He felt something crack, white-hot pain travelling from his wrist and causing tears to pour from his eyes. It took him some minutes before the pain dulled to a painful throb. He struggled to his knees, looking around to understand what was going on, while gingerly holding his arm across his body to prevent his wrist from jostling. His eyes widened in shock as his eyes fell on a familiar face. All the blood drained from his face in absolute horror. "No!" he wailed. "Amy, how could you?" William whispered with a sob.
A cold malicious laugh was heard through the forest, sending a chill creeping up William's spine. "Well, hello nephew. Welcome to my camp." Cassandra's step brother cackled evilly, leering down at the young prince.