Wave Imp Evolution Quest

Go see Tannah in the Daingean Machadae and be prepared to fight. Bring friends as I doubt you can win alone. As soon as you enter and she notices a dti, she'll talk and then summon 2 Earth Elementals to help her fight you. Tannah doesn't aggie, so don't bother attacking her before her elementals are dead (unless you're trying to blitz her and flee from her summoned mobs afterward---but that hurts just as much as killing her elementals first). Note that if Tannah moves whilst you are fighting the elementals, when you follow her she will summon two more elementals as you enter the room. When she summons, an Orb of Silt will appear upon her. Loot it from her corpse after she dies. To evolve, you have to give it to Vincent when you're level 250. Unfortunately, it is a key item so you cannot save with it. So it is propbably best to do it after you hit 250.