Bangle of Warding

 You must use an action to clasp this metal bracelet around your wrist or ankle, or that of a willing creature within your reach, the bangle emits a ward of abjuration magic from it that has 75 hit points. The wearer of the bangle can use a reaction whenever it takes damage to speak the bangel's command word, "safeguard", causing the magical ward to take the damage instead. Any excess damage carries over to the wearer. Once the bangle is at 0 hp it cannot be used in this way again until the following dawn.

Credit: Griffon's Saddlebag 

"Be warned, or be warded."

— Students' mantra scrawled above the abjurer wing's quarters