How Do I Kill Yharon

Touching the flame pillars will deal massive damage, and successfully leaving the arena or flying above Yharon’s designated enrage height (660 blocks high) will cause Yharon to become enraged, which massively increases his speed and quintuples his damage until the player returns.

How do I get Yharon's crystal?

It has a 100% chance to drop from Jungle Dragon, Yharon in Malice Mode. Yharim’s Crystal cannot deal any knockback. Its best modifier is Demonic or Deadly for damage output, or Mystic for mana conservation because it cannot get modifiers that affect knockback.

How do you summon Supreme Calamitas?

Supreme Calamitas does not spawn on her own and requires the player to summon her with the Altar of the Accursed, which uses Ashes of Calamity or the Ceremonial Urn; upon using said items at the Altar, the screen will darken, shake, and become tinted red before Supreme Calamitas herself appears above the Altar.