The Kreyis should be implemented into the game more often. Once or twice a year at least. It usually works its way out of circulation anyway, but it is hardly ever used.
Kreyis
How do you even get that thing?
The Imms do a global echo and throw the golem who carries it somewhere random and then the hunt begins.
It doesn't usually come down from the imm rooms, but it is fun watching it get passed around when it finally does come down.
Such a worthless weapon though 
sadly and honestly i can say i've never had the opportunity to hold, identify or use kreyis would have loved to have used it on Hermie... would have been interesting to say the least 
Object 'Kreyis Sacrosanct Blade glowing rock starshard' is type weapon, material unknown. Extra flags: glow evil bless burnproof socketable. Weight is 0, value is 0, level is 50. Weapon type is exotic. Damage is 8d6 (average 28). Kreyis the Sacrosanct Blade of Aabahran adorned with a starshard has the following affixed to it: (Glowing) a starshard Affects luck by 1. Affects damroll by 1. Affects hitroll by 3. Affects hitgain by 5. Affects deflect by 5. Affects embrace by 5. Affects wish by 5. Affects flamestrike by 5. Affects onslaught by 5. Affects entangle by 5. Affects veil of darkness by 5. Affects rage by 5. Affects insect swarm by 5. Affects voodoo by 5. Affects divine retribution by 5. Affects ray of truth by 5. Affects minister by 5. Affects death grasp by 5. Affects sear by 5. Affects brawl by 5. Affects plant by 5. Affects caltraps by 5. Affects offhand disarm by 5. Affects enchant armor by 5. Rare item.
Not the current stats of the blade though. When I had a look it was average 24. This blade usually changes its damage verb and its average damage from time to time.
May be able to have it 'pop' when certain conditions are met, but I rather like it as a rarely encountered weapon. Plus, it isn't intended to be a one shot kill weapon, more flare than anything.