Warning, melodrama, a crap ton of text and 3 videos ahead. Also my apologies, I couldn't get the spoiler tags to work right for the videos.
Upon the Heroes finally making it to me after going through sheer hell, I would turn to face them, narrow my eyes at them, then walk over to a bloody massive sword hanging from the wall and pick it up. The Heroes would demand to know why I did the things I did, to which I would simply reply "You don't need to know", then this would begin playing.
My fighting style would be purely physical, I would relentlessly advance on the Heroes regardless of what they hit me with and any strikes I land would send them flying back and deal heavy damage. At 50% health I would place an unremoveable buff on myself that boosts my physical damage even further. Upon being beaten my sword would break, I would be bleeding a bit and the music would fade out.
After wiping the blood from my face and tossing aside the broken sword I'd grin and crypticly say "Could you be the ones?" Then, after looking at the Heroes confused expressions for a second I would hold my arm out in front of me, a ominous black and red flash would emit from my hand which would rapidly twist into the form of a longer than usual Katana. Then this would begin playing.
My fighting style in this form/phase would be a mixture of physical and magical attacks, I would also move much faster and attack more rapidly, though due to the lighter weapon I would not deal as much damage, nor would my attacks be able to send any of the Heroes across the room, essentially my style would switch from raw power, to skill and speed. At 50% health I would begin using various debuffs on the Heroes in addition to physical and magical attacks.
At 25% health I would begin using a rushing attack that, if it connects, would instakill one of the Heroes. If said rushing attack misses however I would be somewhat vulnerable as I recover. Upon being being beaten in this form/phase my blade would be knocked out of my hand and I would be knocked back several feet, landing hard on my back. My blade would embed itself into the ground missing my head by no more than an inch or two and the music would fade out.
After struggling to get back to my feet I would be battered, bloody, and barely able to stand, using my blade to steady myself. The Heroes would declare that the fight is over, as I'm no longer able to fight and barely able to even stand up. Partially blinded from the blood in one of my eyes I would look at the Heroes, the confidence gone from my face, replaced instead by a look of resignation.
With some effort I would pull my blade from the ground then stumble towards the Heroes, who now look reluctant to fight as they would be in essence attacking a man who is already beaten. As I stumble towards them, barely able to stay on my feet, I would say "You're not finished yet." Then this would begin playing.
My fighting style, if you could call it that, would be purely magical as I barely have the strength to move. I would cover myself in a barrier that protects me from harm, both physical and magical, though the barrier itself would shatter upon taking enough damage, allowing me to be attacked until I could restore it. I would cast various buffs on myself, debuffs on the Heroes and use various elemental and non-elemental spells to attack. However as my skills lie more with my physical nature, my attacks will do the least damage compared to my previous form/phases, also as I am already greatly weakened my health will be less as well. At 25% health I would begin using a powerful spell that, if it connects, deals heavy damage and places an unremoveable debuff on one of the Heroes. This spell would also greatly damage my barrier.
At 5% health I would begin preparing a final spell that, if I succeed in casting, would instakill all the Heroes, however if the Heroes manage to shatter my barrier the spell will backfire and finish me off.
Upon being defeated the energy in that final spell will destroy my blade and most of my body, leaving me lying on the ground. The Heroes will look down at me, regretting that it went this far as I choke out my last words, "Thank you."