The Conversion Ritual Spell is way too overpowered.
This mod makes it use 200 of your Witch's magic (Instead of 30MP) and drops the chance of an EP7 gem from 20% to 10%. Therefore, you cannot use the spell again until your Magic is almost fully recharged.*
*You CAN use the spell again, as with all spells, but because you won't be able to afford it, it will backfire. It uses around 70% of your magic pool (the XML implies 200 is the whole pool, but in-game, that's not the case) so you'll want to wait until you're SURE you can afford it to use it!