Borrowing Bracer

Wondrous item, rare (requires attunement by a fighter)

This tooled leather bracer is inscribed with magical runes. When you are the target of a beneficial spell that requires concentration to maintain, such as bless or haste, as a reaction you can take over concentration on the spell from the original caster. All other aspects of the spell remain the same, including its remaining maximum duration from the time it was cast. The original caster no longer needs to concentrate to maintain the spell, but if your concentration is broken the spell ends. You cannot concentrate on more than one spell at a time, but you can end concentration on one spell if you wish to borrow another spell.