Hotties:
Nathaniel looked over the slaves' hands and winced inwardly. These symbols had no power in them; they simply glowed a little and conducted energy in an unproductive way. Still, there was a way to salvage the situation. If life gives you lemons...
"I have no doubt that all of you, my long-lived minions, have suffered at the hands of other races: humans, goblins and especially dwarves. You may have thought that there was no escape from that cycle of humiliation and helpessness; however, I am here to say otherwise. I, NATHANIEL THE THUNDEROUS, present you with a new job: hurting them back!"
"Many of you remember the dwarves' favorite weapon: fire. They have burned down many a retreat with their fire snake bombs and charcoal scatterguns; countless forests have been burnt down by dwarves for no reason other than to hurt your people. Well, I offer you to tame the fire! To use it to fight your enemies! To make those who sit on wooden chairs and fuel their stoves with logs feel the agony of a burning tree! I give you FlameMaster 2000, an unintrusive bodily augmentation that allows you to make flesh as flammable as wood!"
"Your left arms carry trial versions of the FlameMaster; they'll only last for an hour, maybe less, before the magic runs out; at that point you'll have a choice whether to get a full version. To activate the FlameMaster, point at the target, concentrate on the symbols and shout 'Soon-to-be-ash!'. If your concentration is sufficient, the target will become flammable at that point; if not, try again later."
"I'll finish by telling you about your rewards. They're simple: freedom and a small starting capital to start your own business of choice, as well as all the augmentations that I deem necessary to give you. Set people on fire and get freedom in exchange; what's not to love?"
Give Hotties the sales pitch about how awesome their tattoos and new jobs are, warn them about the fact that I'll have to install new tattoos soon, and instruct them to point and shout 'Soon-to-be-ash!' whenever they want something to be flammable.
Light their torches. Get mentally ready to inconspicuously make their targets flammable with my own magic.
Oh, and if any of them try to test their new augmentations on me, tell them that people in my profession don't live long without making themselves utterly non-flammable. That's a lie, of course, but I'm not making myself highly combustible on some slave's whim!
Judges:
"I have taken the powerless, the downtrodden, the victims of fires, and I saw in each of them a future arsonist. By the means of alchemical symbols on their hands, my minions are ready to turn flesh combustible and to retaliate for the forest fires that were used to capture them! They have rage aplenty, and I gave them the means to express that rage; let's see if a combination of magic, arson and actual muscles brings something new to the field of fiery murder."
Present the Hotties in such a way as to appeal to the Manic Judge's tastes. Act confident in my minions so as to throw off any suspicion that I'll attempt to help them out.