The Apex is the Boss Dimension of the Zenith, in which resides the cold-hearted Skyknight Deity, the Snow Phoenix. It currently is not implemented into the mod, but it will be a Finite dimension, so only a certain amount of land will be generated.

Rumour has it that the Skyknight King did not actually die, but he was trapped in the Apex with the Snow Phoenix, whom had been infected by an Enderlord.