Mantle of the Crimson Horizon:

The wielder gains the Magical trait and +1 Armor. When the wielder would take damage, they may sacrifice an adjacent unit at full HP to gain +2 armor until the end of their next turn. If the sacrificed unit was Undead, the wielder also gains +1 Damage until the end of their next turn. Additional Effect: At the start of their turn, the wielder may sacrifice an Undead unit on the battle map and lose 2 Health to teleport onto the space it occupied. The wielder then gains an additional attack this turn with base damage 1.