ToME WikiIf you are currently under the effects of Essence of Speed, and re-cast the spell, your speed timer is not reset, which can lead to a nasty surprise when you run out of speed in the middle of the battle you had just prepped for. Characters like Warpers may depend on continually having the extra speed boost, and while I certainly don't think that the timers should stack, re-casting the spell should certainly reset the timer. I can only assume that the reason why this spell doesn't work this way has something to do with the fact that Essence of Speed has both a timer and a value (e.g. you might have 40 turns of +7 speed, or 60 turns of +12 speed). I say just ditch the old timer and value and replace it with the new one.