Helicath is a unique champion bring both a Valkyrie style shield that is based on his own Defensive stat and a 2 turn block damage buff. A very flexible champion that can be used in both Unkillable or Traditional clan boss teams.
Using the original Tower/Skullcrusher Unkillable, but utilizing Helicath to block damage on the clan boss AOE hits and his Shield to prevent dying from the stun. Allows a cleanser or debuff blocker keep your team stun friendly against affinity CB
Using Partial-Booked Renegade and Warcaster/Skullcrusher to stay unkillable. Affinity can be difficult to navigate, but there are solutions. An excellent option for those lacking other unkillable champions.