Nothing, it seems. The burning sensation in your body only intensifies- Turning unbearable, even. The burning pain only continues, ignoring your cries of pain. Heating up, you have to force your eyes shut, as your nose only smells the putrid smoke. Something- Either a tear or a drop of sweat, drips down your face. But it's not enough to dispel the fire burning away at your flesh.
The fire burns and burns, to the point where you feel yourself start to finally lose consciousness... Or die. Dying is a more accurate word to describe it. I mean, your body is literally being scorched, soon to turn into black ashes. The last thing you feel before you fall into black is your eyes watering, still shut forcefully. And the last thing you remember is the sound of the wind.
...
You slowly regain your senses. Where are you? Didn't you just burn to death a few minutes- No, hours- No, days- No, years ago? You don't feel the floor of the Spartan Colosseum anymore, that's for sure. As you slowly breathe, you open your eyes. Everything looks a little blurry to you. But you can recognize that you definitely aren't in that area. You feel a sudden gust of both cold and hot winds.
It's then you look down at what you're standing on. Rocks. Molten rocks, to be specific. Right near a volcano. Wait a second... If you're standing, then why aren't your feet-
Oh.
Oh dear.
Your eyes are no longer drawn to the dangerous environment around you, but what happened to yourself. Standing on the rocks, rather than a pair of feet, there are two, golden talons, each with three sharp claws, presumably used to both stand and capture prey, assuming there are any lifeforms on this uninhabitable landscape.
You attempt to call out, to see if there's anyone to help, but it only comes out as a nonsensical screech. Your mouth has been replaced by a deep, yet bright colored yellow beak. It's then your attention is drawn to your skin- It's now covered in a flurry of crimson and orange feathers. At this rate, it's pretty obvious what happened to your arms. They've turned into wings, obviously.
But it's then you realize- All this time, you've seen smoke coming from right behind you- Close behind you. You spread your wings, seeing a pattern of bright colors... But at the ends of your wings, you can see fire. You squawk yet again, in panic, worrying that you will burn up yet again. ...However, the flames don't scorch you. In fact, they don't hurt you at all.
It's then you finally come to the obvious conclusion- You've turned into a Phoenix, to be specific, the Greek and Roman version of the being. An immortal bird of flame. This doesn't sound so bad in your head, but then you realize-
You can't speak, nor can you die. ...No wonder that weird voice guy gave you this punishment. Well, assuming refusing to get (potentially) ultra-super-powerful is any reason to get an extreme punishment such as this. You sigh, coming to terms that you're now on your own- Potentially forever.