[Banestorm] Introducting [DF20] Slayer powers into Banestorm setting

[phayman53]

Looking for people's opinions. I was thinking of running a Banestorm game and I really like the various slayer powers from Dungeon Fantasy 20: Slayers. I wanted to introduce them into a Banestorm game if the players wanted to play a mage or undead slayer (I would allow demon slayers, but they are not quite as common so probably not the best to play). I am also looking at a 150ish point game, so I wouldn't use the templates in DF20 as-is.

My question that I would like opinions on is: would you use the powers as-is, or require a Mysticism power modifier in order to keep consistent with the world of Banestorm? If so, what disadvantages would you use. Most of the Mysticism power modifiers are pretty crippling for any adventurer. Both Discipline of the Faith: Mysticism and Monasticism, common ones for Mystic powers in Banestorm, require most of the character's time according to RAW, so I wouldn't want to use those since being a slayer is specifically about going adventuring. Assuming I don't use those, what disadvantages would you use for the power modifier? I could see something like Discipline of the Faith: Ritualism mixed with an obsession to slay the given type (in the case of magic users, it would be evil magic users).

Thanks!