Chaunti said:

I in advertently leveled up a warmaiden to 4*. Will the fuse still work for Relickeeper or do I specifically need a 3* that is fully ascended (that is get a new one and start over)?

You specifically need what it tells you to have.

You have to start over, but WarMaiden is a very good hero!

WarMaiden can be very helpful in Arena Offense + few dungeons.