Solved [please delete]

[DM_for_once]

I seem to remember there being a magic item that let you take half of someone else's damage, but I can't seem to find it anywhere. (I'm building a bodyguard, and thought it would fit well.)

[Madcrafter]

Ring of Friend Shield, 50k gp in the DMG

[DM_for_once]

Ah, right thanks. I can't believe I missed it.... I was looking right at it at least six times. Meh.