sentinel only i used killer prime horus and visions eddie. killer prime hits so hard he just cleans everyone up. you dont need the 6 set talismans, just equip max levels that pump up his damage. I added Future talisman to horus to help ensure stuns.

For the 6 turns or less, i cheated. I used eternity eddie and sehkmet. You take all the turns, the opponent never gets a single attack and it doesnt count as a "turn" so no matter how long it takes, you finish the level in less than 6.