Prism staff? Garbage.

Nobody wants a staff with tons of 100 subpar stats, and if they do they should keep quiet. Unless this prism staff can offer the same benefits as the magian 99 staves then this prism staff is a waste of time and is ~2 years too late. Any mage that is worth anything uses magian staves to augment their primary magical functions and a prism staff will do nothing to reduce the need for tons of magian staves...

Instead of a prism stave, there should be some synergy recipesto combine magian staves. For example, combine the dark, fire, earth, and ice magic damage staves together into a one "Darkness" stave that has the same magic damage for all such staves. Across the board, a mage could then get by with 2 staves for nuking, 2 staves for magic accuracy, and 2 staves to cover all the avatars, etc. (I think leaving cure staff as stand alone is perfectly sensible). Alternative to a synergy of gear, you could have a new magian staff path that requires you to start a new staff and has a few preliminary trials that require you kill under do multi-element conditions and then the final trials require a trade in of the completed 99 staves that we actually care about.