Soloed with a 4L6 Friar. No potions or buffbot, and my template wasn't too great since I had 2 unleveled artifacts I was working on equipped. Took me about twenty minutes. Ran in, did some damage, ran away and healed. Rinse and repeat. Luckily the snake spawned no other mobs, and it did not move. It did, however, chain cast Mez on me.
Big see through snake that isn't too hard if you have a good group. He damages you each time you hit him and sometimes spawns small yellow snakes. Beat him last night with 1 Paladin, 2 Clerics, 2 Mercenary and 1 Minstrel and it was OVERKILL ! Once Ylyssan dies an NPC spawns and hands you the gloves.