Magic Site with Special Units/Effect wish:

[Nagot Gick Fel]

Abd Al-Azred Library.

Only feebleminded leaders can enter.

Effect: Sends a random Horror (80% Lesser, 15% standard, 5% Doom) to the designated province. There's a small chance (5%) the Horror will attack its summoner instead, or (15%) the attempt will misfire and trigger a random ritual targeted at a random province instead.

OFC, the site horror marks anyone who enters as well.