So with Giant Bat skill in the game, I wanted to discuss that in relation to some future skills. I hear Vampirism will be a skill thanks to a stretch goal, and it would seemingly make sense for the vampirism skill to have some degree of control over that bat form for those who choose to have both skills. As for de/buffs, maybe vampires have slightly weaker attacks during the day, and sightly stronger attacks at night, with increased bat movement speed at night at the cost of not being able to transform into a bat during the day.

I don't know what the lore looks like for these future skills, but since Clrerics seems to be a future skill, maybe Clerics and vampires could be ancient enemies of each other, and both sides have events similar to the druid or lycan events/quests where you have kill npc vampires or clerics, depending on which skill you are using.