alright i think i finished the, story? quest so far, a lot of trial and error since the game don't tell you almost anything. the game is full of bugs, once you finish the vampire lady quest you will be unable to enter the bar in royal capital or the low traffic street because doing so will trigger the last scene with the vampire girl again or freeze your game.
how do you get to the abyssal woods depths? I can go to the space before it but not the woods them selves.
you need to complete the "snake goddess blood" quest first, talk with the girl at the bottom left part in the camp for adventurers, then go to the temple of the serpent and beat the boss to get her blood, once you complete the quest you can go to the abyssal woods depths, also you need to go through the woods depths to go to the poison swamp and then to the ancient castle.
help with Immortal quest what to do after finding body
also Yarizo dissaper after sleep in swamp
go to the port town and talk with the guy with the ship that takes you back to the royal capital and select the new option to talk with a lady that knows how to beat vampires and she will give you the key to the ancient castle. then just proceed to the camp for adventurers if you don't want to do any of the side missions along the way. with the yarizo thing i don't know, the game is full of bugs but still by the time you enter the ancient castle Yarizo will leave your party anyway because a Vampire lady will join your party and once you finish the quest she will form a companion contract with you.