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Glospeys Skaven

In vanilla, there's never a reason to establish an undercity. You're usually better off just taking the settlement or, maybe, razing it. This mod's first aim is to make undercities viable.

It also does the following:
--The warlock laboratory now grants faction-specific buffs.
--Clan Mors has a Mors-specific summon that summons Storm Vermin, More Mors (in addition to Menace Below, not a replacement). Every army in the faction with Queek gets 1 use. If you buy 5 uses of Menace Below, this also grants you an additional use of the new summon. If you buy 10 uses of Menace Below, you get another additional use of More Mors.
--Undercities are no longer destroyed when the city above them is razed. HOWEVER, while there is no one to steal from in the city above, the undercity will have VERY limited utility while still costing you resources.
--Many Undercity buildings grant hero capacity and/or hero recruitment rank.
--The ritual that grants an undercity-granting engineer has had its cooldown reduced to 20 turns (from 30).