Wondrous Item, legendary (requires attunement by a Requires attunement to a character with the 10 summons technique)
Your vitality is connected to your summons & vice versa.
half the damage you deal with unarmed strikes heal your summoned creatures. alternatively, you can forego this healing to gain advantage on attack rolls, saving throws, or skill checks to your summons.
Notes: Requires attunement to a character with the 10 summons technique