here is another idea i had this one is a Game Of Thrones(aka A Song Of Ice and Fire) and Van Helsing cross over

Gabriel looked around in confusion the last thing he remembered was the dying Dracula swinging his clawed hand at him seemingly determined to take him with him. all that was around him was a bleak grey expanse.

then a white tree with red blood colored leaves faded into his vision this tree had a face carved into it. one that looked like it was laughing.

suddenly he heard a voice in his head "Gabriel so called the hand of God i an a member of a race known as the old Gods to the First Men and i have a proposition for you"

"What" he answered in confusion "and how can a tree be a God if you even are a God" the challenge in his voice was unmistakble

"this is not my true form this is just the medium that our follower choose to communicate with us their are others medium like the form that the Andal's twisted to their own ends with their hate of all they don't understand like magic" the hard powerful voice answered " and we are Gods to your species understanding of the idea it's unlikely you know of what i'm talking about as it's a world very different to your own where this is happening are you willing to listen to my proposal or do you just want to move on to be reborn again as is the way of all mortals"

Gabriel sighs "very well then lets hear it"

"The First Men our follower are being attacked and if they are lossed then they will take with them knowledge that will be needed a long time from where you shall be place eventually leading to that world being covered in ice cold and dark abominations ending all life but their own and their undead servants" answered the powerful voice "my kind do not want that to happen and are willing to intercede to stop this however the last time we interacted heavily in the mortal world did not end well for those we had tried to protect so we have decide on a other course. one that will give you a something you have always wanted."

"really what is that" Gabriel ask in interest

"A family. More specifically the most powerful and Honorable of our human followers known for their magical power, marshal skill and intelligence. at least when it doesn't concern politics so the knowledge you hold be put to great use. if you accepted i will tell you more if not i will look for another to fulfill the roll or even make someone to do so."

Gabriel thinks about about for a few seconds before he comes to the only conclusion he can. he swore he would do anything he could to protect humanity and if he didn't help it could he with them extincted in this world. plus he had always wanted a family "very well but i don't want my unnatural long life span to come with me" thinking about how he didn't want to outlive any friends and family with the knowledge that he would outlive them all just because he wouldn't age

"very well then mortal but know this you will be born without it but the curse attached to your soul and old body will come with just changed to be a blessing you will be in control and be able to change when ever you wish alongside that you shall have your new family's ability to warg animals and their deep connection with direwolf's thou you shall not have the rare greensight as that is both a curse and a blessing one you shall not need for your future task. the crossbow your friend made would help if a flint was added to set each arrow on fire as it's shot then all the better the poleaxe would be a good weapon to introduce as an all purpose melee weapon (war hammer on one side axe on the other with a spears spike on the top and butt plate at the bottom ) but you can forget the gun as their is no sulfur or crude oil in that world. your knowledge of stonemasonly only match's their own but mining and metal working and how to mass produce steel with a blast furnace and bessemer converter with limestone lining can help the current problems alongside your more knowledge of modern farming including glass gardens aka green houses and how to farm and tame animals" the powerful voice sounds pleased with itself

"however in the future the only effective weapons will be ageist the real threats for the abominations are dragonfire, obsidian aka dragonglass and dragonsteel aka valyrian steel which is normal steel with crushed obsidian and dragon bone added to it all. most think that their are magic spell weaved into the metal but that is untrue and a cover by it's creators for it magical properties gotten from the magic of the two added materials the undead servants can only be destroy with fire. thou they burn very easily so a slow burn gel on melee weapons and fire arrows. if possible you should get the Free Folk aka Wildling to join you along with the Giants(with their mammoths) and if possible the Children Of The Forest or at least get enough to join you so that they have a large enough gene pool to not go extinct if abominations try to kill them off. getting dragons(that maybe also be a useful supply of dragon bone to make dragonsteel) and/or gryphos and taming them would massively help later on to go with the direwolf your new family the Starks kings of the North will have. good luck Theon Stark may the Andal's fear your very name when they come" and with that Gabriel closed his eyes and felt suddenly very tired weak and small

"it's a boy milady"