A powerful chest that when used correctly, has better mitigation than a Lightning Coil.
The important feature to this chest is the generation of Endurance charges. Killing 1 enemy will grant a charge, killing 3 in a row will max them out.
When used with a manual cast Immortal Call, or in my case, a secondary attack linked to a Cast on Crit - Immortal Call, you can easily maintain constant uptime of physical immunity.
See "Flicker - CoC - IC" in the Notes section for full details on the use of this chest.