I'm sure I checked this...

game/modules/tome/data/general/objects/boss-artifacts-maj-eyal.lua

@@ -1194,7 +1194,7 @@ newEntity{ base = "BASE_GEM", define_as = "CRYSTAL_HEART",
 					o.use_no_wear = true
 					o.use_power = { name = "recover the Crystal Heart (destroys this armour)", power = 1, use = function(self, who, inven, item)
 						local art_list = mod.class.Object:loadList("/data/general/objects/objects-maj-eyal.lua")
-						local o = art_list["CRYSTAL_FOCUS"]:clone()
+						local o = art_list["CRYSTAL_HEART"]:clone()
 						o:resolve()
 						o:resolve(nil, true)
 						o:identify(true)