Skullcrown is one of the most sought after arena champions in the game. She has extremely powerful nuke abilities combined with an extremely powerful [A3] that places a [Unkillable] buff on this champion for 1 turn every time their HP drops below 20%.
Skullcrown is an ideal champion for blender comps in the arena because her [A1] Attacks all enemies and also places an extra hit if the target has more than 50% HP.
If you are using Skullcrown for your arena team any books will improve her damage potential. When looking to use her in a blender composition you want to get her [A1] ability fully booked to truly let her shine!