Icehowl is an encounter inside the Winterspring set of Mercenary Bounties.
This bounty can be picked up from the Bounty Board and recommends a Party level of 30 to complete it.
You can unlock Icehowl by first completing Ursula Windfury.
Completing this Bounty will unlock the Ahune Bounty.
Whenever this destroys a character, transform it into a Block of Ice.
Potential Icehowl Bounty Rewards
In addition to earning Mercenary Coins based on your Party members, Bounties are assigned to specific Mercenaries to allow you to target loot better.
The following Mercenaries can have their loot appear in the Icehowl Bounty: