Cane of Corrosion "Deep Ray"

A staff with a dark jewel discovered inside the temple ruins of Gormarey. It gradually alters the holder's internal mana with every spell cast. When the conversion is complete, increased mana affinity allows it to use powerful arcana. This seems like a benefit, but the tampered mana is incompatible with other staves. Since this makes even simple magic impossible without it, those who rely upon it must be prepared to become totally reliant.