Alice fixates Nezzner and prioritizes keeping him from using somatic or verbal commands. She tries stretching out his arms for Cat to cut off his rings.
Cat catches him and enters rage again, gaining 4 temporary hitpoints. Following Yulya's order, she attempts to cut off Nezzner's rings with a heavy strike of her Greatsword, flanking with Alice.
With a focused and deft heavy blow Cat manages to lop off three of his rings. As the fingers separate from his body, you see one of them clearly attempting to heal before it falls helplessly to the ground, another instantly disappears to an unknown location using greater teleport, a third clings to life for a few moments before finally giving up the ring. As you can clearly see, he had quite a few tricks up his sleeve.
Cat keeps focused on Nezzner but is aware of the skulls. Depending on her movement, if Yulya is within range, she gives her temp HP. If not then to Alice. Cat makes a sweeping strike with her greatsword. Depending on what Alice achieves, or better what he's got left, Cat targets Nezzner's staff, ring, and amulet, as well as the flaming skull.
