Mage - Scrolled for vit and def. Plenty of pots and stones. Removed weapon just so clone wouldn't have it.
Archer - Same as above.
Cleric - Same as above + removing shield.

Mage one was the easiest cause she killed it faster than my archer and my cleric, haha.

I didn't really use armor, but I had scrolls.

I did it the second day of open beta, so no one çõüłd Endure buff! ^^

Naked, with shield, aim, and vitality, but forgot to remove weapon/hat. At least i got to see bleed before reaching that level... (I am a cleric btw)

my mage got lukky, i guess it was a glitch or sumthin, but after i killed 2 stone golems or w/e and ran after my twin, i started hittin him with all i had, then realized he wasnt even attackin me after the 1st couple hits, so after i finned with him i took care of the last golem commin at me and success. eh, im workin on a fighter now, doubt ill be as lukky. did that happen to any1` else btw, o yeah, and i was confused, i print screened it, but i guess it doesnt auto save, some other player, not npc was there 2, he had like 8000 health an sp, and was just standin there, wenever i tried to run up to him and clik it had that "..." thing on him.

I believe the archer clone only had one skill attack.

i Just went in with the nube club and when the other guy appeared i just equipped my strongest armour and weapon i had buff XD then i just healed myself while fighting the dud

That is hard one for me to answer, cause I did the lvl 20 quest with every class buffed/unbuffed... never tried naked though.