From HGWiki

Abode of the Shadow Pontiff (level 35 accomplishment (see Accomplishments)) and his minions, the priests cast Implosion and should be removed/disabled ASAP unless you have immunity to this effect and the Morticians cast Flesh to Stone. Shadow Elementals are vulnerable to fire damage so Delayed Blast Fireball is a good choice or they can be Disintegrate'd with no kickback.

Rest Spawn Chance

Zero

Creatures

• Arcane Spectre
• Witchkin
• Warrior Spectre
• Rogue Spectre
• Living Darkness
• Shadow Guard
• Shadow Priest
• Shadow Elemental
• Mortician
• Shadow Pontiff

Exits

• Tomb of Shadows
• Note: Whilst the Higher Ground map shows a passage to the Tower Cavern this is in fact inaccessible due to a rockfall