Here we are, the final battle. I have both endings for you and I'll post them at the same time within the week.
A loud roar pierced the air followed by a booming voice. "WRETCHED SON OF NAGA. YOU WILL BE DESTROYED."
Dragon Grima's shadow loomed over head, the massive body seemed to block out the sun.
"This is it." Lucina said in a voice barley above a whisper. "Do or die, as they say."
Morgan took her hand and squeezed. She squeezed back.
"Is everybody ready?" Chrom asked.
Robin gave him a smile that held more confidence then he felt. "As ready as we'll ever be."
"Then let's finish this!"
Summoning her power, Naga teleported all she could high into the air atop Dragon Grima's back. No pegasus or wyvern could fly to such altitude on their own. The wind was bitterly cold despite a volcano down below. Hair, cloaks, and coats were whipped about. Robin worried if bows would be of any use up here.
Human Grima sat before them cross legged seeming rather board. His face had changed since the last time they saw him. His eyes were now an eerie red and below them were two more sets of eyes or eye like markings, Robin couldn't tell, but it mirrored the design on his hand.
"I can't decide if you worms are very brave or very foolish." He did not raise his voice to speak, yet everyone heard him as though this were a friendly chat over tea. "Either way, you took your sweet time getting here."
"I have a question." Morgan raised his hand.
Lucina quickly smacked it back down. "Not the time or the place."
"Now is exactly the time and the place." Grima assured her. "I want to hear what the little blueberry has to say."
"Blueberry?" Chrom mouthed to his husband who pointed to his hair.
Ignoring the nickname, Morgan ask. "How can you be the dragon we're on and the person before us?"
Grima rolled his eyes so hard it almost looked painful. "I can raise the dead, turn the world into a wasteland, go toe to toe with Naga, and I'm unkillable. Is being able to split my consciousness in half really that weird?" He rolled his eyes again. All Morgans asked that question. "And before anyone asks, because I know someone will, I didn't want those you couldn't bring to feel left out, so I thought I'd have my Risen King keep them company." He tapped his chin in mock thought. "I wonder how many he's slaughtered by now?" Grima made a show of yawning. "Look, I'm growing bored, so can we just get to the part where I do this?" He raised an arm into the air summoning spears of swirling black and purple around the group. When he dropped his arm a half second later, the spears rained down. Though there was no visible damage, everyone cried out in pain falling to a knee or lower.
"Wh-what, what manner of magic?" Chrom panted. He felt as if he'd been cut a thousand times yet he saw no blood.
"That…was no…magic." Lucina forced herself to her hands and knees, but that was as far as her body could go. That effort alone had winded her and she could feel the sweat already cooling. "That is…his power."
"And so it ends, Robin." Grima walked lazily to his other self. "See how frail these human bonds of yours are? How short lived? How pointless?" He leaned forward to come face to face with a kneeling Robin. "You have all thrown your lives away and the result is the same!"
"Get away from him." Chrom growled out finding the strength to grab Falchion's hilt, yet that was all he had. There was nothing left to pull the sword free let alone swing it.
Grima scowled at the Ylissen prince. "I don't need you, you know? I already have one king. Another just seems…excessive." He turned back to Robin leaning in even closer so he could whisper into his ear. "I bet you didn't tell him or your little kiddies which Chrom it really is." He pulled back. "I suppose it's time I got you all off my back, so to speak—permanently." He smiled showing his fangs. "Get it?
"We're not done yet." Robin gritted out.
"Ya kind of are, but you don't want this, do you?" Grima cocked his head to the side. "You do have a choice, you know. It doesn't have to be this way. You can still save all your friends." He held out an ungloved hand, the fell dragon mark clearly visible. "Become one with me, and we shall spare their lives. Refuse, and watch as I rend the flesh from their bones!"
"Mother, you can't!" Lucina cried out. "He's lying!"
"It has to be a trap!" Came Morgan.
"I will have your decision!" Grima snapped his fingers in quick succession, impatiently. "Will you save these worms? Will you JOIN ME and become a GOD?"
Robin weakly batted the hand away. "Do you think me a fool?"
"Yes, I thought that was obvious."
"You'd kill them anyway!"
Grima made a 'well, duh' face. "Of COURSE I would. You're mine either way, I only thought you might want to leave your comrades with a heroic, selfless image." He raised an arm towards Robin with his palm out. A cloud of swirling black and purple formed around him. "But so be it. Leave them with the final memory that you were their undoing!" He clenched his fist and in an instant, the cloud and tactician were gone.
Chrom stared in horror at what he'd just witnessed and did the only thing he could do; yell. "Robin!"
Blackness, like a starless, moonless, night was all Robin could see. "Where am I?"
A transparent Grima manifested before him. "Where your god wills you to be."
"You're no god!"
"Let's not start with the semantics, okay? I have a lot to do, namely, get a bunch of fleas off my back. Literally."
Despite the situation, Robin rolled his eyes. "Still not funny."
"Yeah, well, you know what is? Dead Shepherds."
"I won't let you!"
"'Let'? Ha!" Grima waved his arm across his body and a force smashed into Robin. "By the time I'm through with you." Another strike. "You'll be begging to join me!" A third strike." But it's too late! The game is over and I've won!"
Blow after blow pummeled into Robin and he was powerless to stop it. His insides were on fire as his legs finally gave out and he collapsed.
Grima was right. It was over and the bastard won. Robin had no final strategy. No cards left to play. No tricks up his sleeve. Nothing.
Grima was right.
?: "—ve to —ack!"
Robin thought he'd heard something, but it had to be his imagination.
?: "Yo— ha— fi— back! —ghting!"
There it was again. Slightly clearer, yet still indiscernible.
?: "Fight ba—! —ave to keep —ing!"
A voice! Yes! There was an echo to it, but could it be….
?: "Fight back, Robin!"
"Chrom?" Robin found himself saying.
Chrom: "You swore to do so, remember? Now keep your damn word!"
"Chrom!" He pushed his torso up with his forearms. "Chrom, I can hear you!"
By this point, Grima was frantically looking around for the mysterious voice. "You are mine now! The dragon's grip cannot be broken!"
Lucina: "I doubted you once, Mother. Never again. You can do this!"
Morgan: "You're stronger than some old, cranky, dragon, Mother. You've got this!"
"I can hear them." The tactician slid his legs under him and managed to stager to his feet. "I hear my family!"
"Stop this at once! SILENCE those wretched voices! You are all powerless! Do you understand?!" Grima stamped his foot like a petulant child. "Frail! Insignificant! You are NOTHING!"
"That's where you're wrong." Robin put a hand to his chest. "I am a husband, a parent, a leader, and."
"If you say 'your demise', I swear!"
"A friend. Human bonds are what give us strength and that's something you'll never understand."
Grima bared his fangs. "I understand more than you'll ever realize."
Light started to penetrate the darkness.
Chrom: "Return to us, Robin! Together, we're stronger than even the fell dragon's might!
Robin turned his back to Grima enraging him even more. "I'm coming, Chrom!" He started to run towards the largest gathering of light. "Hold on!"
Like going through a door, Robin was back upon Dragon Grima's back. The human form had teleported to the dragon's neck.
"Mother!" The siblings cried.
"Children of man, take my power!" A warmth washed over everyone as Naga spoke. "Rise now and face the fell dragon!"
As one, the Shepherds stood, weapons drawn.
Grima growled low and the dragon let lose a deafening roar. "This means nothing! I've concurred this pathetic world nine times before now! All of you have died by my hand one way or other. This time shall be no different!"
"Hear my words, Awakener! Grima's servants will beset you to no end. Dispatch him as soon as you are able! Once the fell one is weakened, a choice will await you. If Chrom lets fall the final blow, Grima shall survive but return to his slumber. If Robin strikes in Chrom's stead, both his life and Grima's are forever over. Only in this way may the fell dragon be destroyed for good and all."
Morgan leaned over to his sister and whispered. "She's said that twice in one day. How could we forget?"
Lucina gave him a weird look. "How do you?"
"Oh, look, here come some Risen!"