Altruism

With this spell, the caster can transfer as many of their hit points as desired to heal a willing, living being of any alignment not directly opposed to their own. (good vs. evil or lawful vs. chaotic). Each hit point transferred restores one hit point lost by the subject creature. These hit points cannot be taken back once the spell has been cast. The caster's current hit points are reduced by the amount actually transferred, and these can be restored by normal or magical healing. The creature cannot receive more hit points than their normal maximum.

Notes: Common for priests from the DARK SUN setting