Kriptonite

 is an alloy.

Obtaining

 * Dropped by :
 * Dark Smith
 * Crafted by a Miner (Lv. 80) from :
 * 10 Bronze
 * 10 Coppery Stone
 * 10 Iron
 * 10 Kobalt Stone
 * 10 Manganese
 * 10 Silver
 * 10 Tin

Uses

 * Used in the craft of :
 * Amakna Captain Shield
 * Ano Neemous Ring
 * Captain Chafer's Small Daggers
 * Chafer Helmet
 * Citrus Daggers
 * Dagger Manic
 * Daguiero's Daggers
 * Daudgee
 * Elya Wood Wedding Ring
 * Falistos' Maul
 * Fantal Hammer
 * Gogorified Miner ring
 * Hammer Ingthaiphoons
 * Hebuse Shovel
 * Helabete Shovel
 * Scratched Imp Shield
 * Kukri Kura
 * Legendary Crackler Boots
 * Lightening Thrower in Bewitched Wood
 * Lightening Thrower in Dark Bamboo
 * Lightning Thrower in Ancestral Wood
 * Lightning Thrower in Elm
 * Lightning Thrower in Golden Bamboo
 * Lightning Thrower in Holy Bamboo
 * Lightning Thrower in Holy Bambooto Wood
 * Loopine's ring
 * Shovel Ijah
 * Nidanwa Saber
 * Ostwogoth Daggers
 * Patter made of Kwak Pointed Feather
 * Phtalmo
 * Polpullet Hammer
 * Pota Ring
 * Red Root Chileepaperz
 * Regah Daggers
 * Tortoi Hammer
 * Shovel of the Dark Miner
 * Spring leaf
 * Terps hammer
 * The Thor-Boyaux
 * Travel Shovel
 * Tribal Ring
 * Winter Leaf
 * Pet food for :
 * Croum

Trivia
The name comes from Superman's weakness, green pieces of rock that landed in Earth together with him, called Kryptonite.

Kriptonite Kriptonita Kriptonit