At a young age, Icingdeath dug out his hole in which he filled with his gold and treasure and soon fell into a deep sleep that lasted 1000 years. When he woke up, the hole was too small to get out!
Drizzt and Wulfgar wandered into his lair to slay the dragon, then having Wulfgar prove himself to the Elk Tribe. Here Drizzt picked up Icingdeath, aptly named, driven into a large pile of treasure.
It was this sword that helped win the day for the two.
Wulfgar then used one of the horns from the dragon as a weapon to defeat the (then) Leader of the Elk tribe.