The mage shrugged as he answered "The magic energy that powers it currently can be reproduced but it is a process that requires years of experience and training. It is similar to what the fire-throwers use so it is possible that it may be able to channel that magic, and yes the stone inside it works as a sort of storage for energy that takes energy from outside sources to continue powering the device, it's merely a question of what types of energy it will use."
he stopped and seemed to think on the last question for a second before continuing "It is possible that it may be able to utilize other energy types but I am unaware of what the enchantment may do in that case. That's the wonderful thing about magic, you never really know what's going to happen until you do it."
((as a note Haralus's second received a message for Haralus while he was in the caves, and since he's more your character then one I'd take much control over figured I'd let you know.))