Destiny Bond

Upon casting this spell, the caster ties their very will and soul to that of another creature, dooming them to shared fates. Choose one creature within line of sight. Until the start of your next turn, any damage you take is also dealt to that creature. The chosen creature takes exactly the damage the caster takes (when it pertains to the casting of this spell), ignoring all immunity and resistances.
(ex.: if the caster has resistance to fire damage and the target does not, and the caster takes 10 points of fire damage, that damage is reduced to 5 for both creatures. Conversely, if the caster takes 10 points of acid damage and the target has resistance or even immunity to acid damage, the target still takes 10 points of damage.)