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Some creatures in Pathfinder can drain Intelligence, and this causes a permanent decrease that only a Restoration spell can undo. The Ability Scores page explains what happens in case of ability damage (temporary decrease) but not what happens in case of a drain.
Then can a Character (PC or NPC) lose some skill ranks when hit by an Intelligence drain (or does it do the same thing as ability damage) ?
From the Ability Drain on the bottom of the Ability Scores page of SRD:
Ability Drain
Ability drain actually reduces the relevant ability score. Modify all skills and statistics related to that ability. This might cause you to lose skill points, hit points, and other bonuses. Ability drain can be healed through the use of spells such as restoration.
