A realm with this holding is immune to the special powers of Underdark realms.
Copyrights:
TSR
Wizards of the Coast
This holding is an AD&D holding and can only be attached to AD&D realms, or realms that allow any holding to be attached. Although any time you see the word immune you may feel inclined to include that card, don't be fooled by this holding.
It confers immunity to the attached realm, but this immunity is only from the special powers of Underdark realms. Only six Underdark realms would be affected by Dark Depths if it is attached to an AD&D realm (TU-2, TU-4, TU-5, TU-6, TU-c6, & IQ-5).
This does include the Triumvirate realms, however, and for that reason should not be completely dismissed. It's value increases slightly if your deck contains several realms that can have any holding attached to it.
This magical land was once deep beneath the City of Greyhawk. Filled with giant mushrooms and roaming Trolls, the Dark Depths were deemed to dangerous and the Circle of Eight estate transferrenced the entire area to the nether world.
