Chances are it's gonna be SO~Expensive that you won't want it on Kelbim.
From the New LvL99 instance Mystic Tavern at Gainak villiage it drops I think.
kelbim/tauti weapons are so not worth having that Crystal though unless you're fully defensive player and want the extra 15% HP badly that you could get this way.. obviously the 5% Patt/Matt options are completely wasted on them..