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Known as the Frost dragon. Not surprisingly he resides in Frostgard. He is another dragon that you will pass thru in campaign but you don't need to kill. He drops a portal rune that take you from Frostgard to Wyvern Pass.
Direction: Use the Seraphim Monastery portal, head South and into the Monastery, go thru the gap in the North, keep going and you will find Sisslith.
Note: Sisslith is one of the three dragons you must kill to summon the Sakkara Demon in MP.