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Oil of Speed ->Potion of Speed *Update*
As per the AD&D 2nd edition Dungeon Master Guide
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Potion of Speed
This potion increases the movement and combat capabilities of the imbiber by 100%. Thus, a movement rate of 9 becomes 18, and a character normally able to attack once per round attacks twice. This does not reduce spellcasting time, however. Use of a speed potion will cause fatigue almost instantaneously, but the other effects last for 1 turn.
Special: Doubles movement and attack rates
Duration: 1 turn