The official GemStone IV encyclopedia.
Wisdom potions can be imbibed to increase the drinker's wisdom statistic for 30 minutes.
The wisdom potions are restricted both by level and time. Each rank of potion has a different minimum level for the drinker; the greater the benefit bestowed, the higher level one must be to take part in it. There is a 60 minute timer on these potions. Any attempt to drink another sip within that time will be denied.
Lesser wisdom potion
A lesser wisdom potion will enhance the drinker's wisdom statistic by five. This item may not be used by adventurers who have not trained 20 times.
Greater wisdom potion
A greater wisdom potion will increase the drinker's wisdom statistic by ten. This enhancement may not be used by adventurers who have not trained 40 times.