From Dungeons of Dredmor Wiki

An effect for casting Infernal Contract as Demonologist, this will summon 4 Demonic Denizens immediately.

After 2 turns you are hit with Lingering Weakness for 93 turns. After 3 turns you are hit with Minor Blood Debt for 6 turns. After 3 turns you are hit with Lingering Dullness for 73 turns. After 7 turns you are hit with Soul Price for 6 turns.