Ascalaphus can be summoned at a summoning station using glowstone (block) as the ignition.
Ascalaphus, the Son of Helvius, is an absolutely overpowered ghast boasting 100 hp (50 hearts)
The Ghast Summon: Occurs every 25 seconds; summons 2 ghasts
Smite: Occurs every 35 seconds; Smites you
Charged Fireball: Occurs every 40 seconds; Summons extremely explosive fireball below the boss
Teleportation: occurs every 30 seconds; The boss will teleport on top of you
Upon killing Ascalaphus, you will receive the Ichor Tear, an ingredient of the Ichor Emblem. If you kill Ascalaphus by hitting his fireballs back at him, you will not receive the Ichor Tear.