Subtype is determined at wand creation. (Fire, Cold, Bludgeoning). Necrotic and Radiant exist but are Rare and tightly controlled. Recharging is slow and dangerous work carried out by qualified magewrights. (If the party has an Artificer, this may be attempted as a skill check using an Eberron shard: Roll a d6. On a 6, the recharge is successful, on 2 to 5, add another d6 to the next attempt, on a 1, take the total rolled as damage and destroy the shard.)