(Click on any item for details)
Damage Skill, M points for D seconds
Permanently lowers one of the skills of the target by M points for D seconds. In the patched game version, this effect is only found in-game on the glove Elvul's Black Blindfold (which is strong enough to rapidly reduce even superhuman Marksman skill to 0). In the unpatched version of the game, it was also found on the weapon Fury, which damaged the player's armor skills.
The skill can only be restored by use of a Restore Skill effect. To undo the effects of Damage Skill, you need to have the most recent patch and go to either a Shrine of the Tribunal for Almsivi Restoration, or to an Imperial Cult Altar for Restore Attributes.
No ingredients in the game or its expansions have this effect, so you cannot make a potion that has it.