you can buy speed potions in npc's. speed potions i think are the following: concentration potion, awakening potion and berserk potion. these potions have some restrictions on which job class and what base level are they to be able to use them. i'm not sure if speed potions can be create by players. can't give you specifics though i hope i helped you somehow. anymore questions, just post here again. see ya (^_^)
