Trading the Masked Salesman

Ifrit's Hammer is mine. It's powerful, beautiful and holds mysteries. I traded a memory for it. Of what I can't say, because it's gone now. This hammer, however, will carry me to glory. I'm sure of it.
 
[Weapon (maul), artifact (requires attunement by a when attuned to this hammer, you are considered proficient with this weapon, you set the weapons command word, and you become resistant to fire damage, while holding this weapon.)
As a bonus action, on your turn, you can speak the weapons command word, (Chosen by the player during attunement.) which will cause the maul to release a mixture of liquids. Depending on which liquids mix, the maul is either shrouded in a gas like cloud, or erupted in flames. In either case, the hammer begins to shed Bright light for 40ft, and dim light for an additional 40ft. Also while ablaze, the hammer explodes on impact, dealing an additional 2d6 damage. The damage type is based on the command word spoken, thunder for the gas, or fire for the flames.
Melee, 5' reach, 2d6+3 bludgeoning damage, 10lb, heavy, two-handed, light.]