Firestones and Spellstones were the preferred temporary weapon enchants for Warlocks. Firestones were preferred for Warlocks that favor direct damage spells (Destruction and Demonology warlocks), while Spellstones were preferred for Affliction Warlocks, who favor damage over time spells.
The original Firestone was an off-handslotconjured item which was later moved to the wandslot (technically a relic), created by the warlock Create Firestone spell, allowing warlocks to enhance their main handweapon to do additional firedamage and gain a fire spell damage bonus buff for as long as the Firestone existed. When active, a Firestone stacked with weapon enchantments, and placed a small fireball that circled the Warlock's weapon. Both the Firestone and Spellstone were widely unused for multiple reasons. They did not provide comparable stats to wands and, like other conjured items, would disappear if logged out for more than 15 minutes.
Types of firestones
Damage dealt by direct spells
Spell critical strike rating
Patch 4.0.1 (2010-10-12): Create Firestone removed from game.