Gives you +1 bonus to both crit range and crit multiplier. (Gives these bonuses for all weapons/unarmed, despite needing Improved Crit & Improved Crit Mythic)
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GraveSingerPlus
Grants you a new powerful spell called Hellbell, which does 10d6 damage of multiple elements! Requires being able to cast spell level 9.
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HellBall-feature