Hangbui Jarl is the first boss in the Wreck of the Polaris, a 5-person dungeon located in Kingsmouth. The quest “Dead in the Water” is available from Ann Radcliffe (located at 388,988) at the Orochi Camp at the northernmost bridge. The dungeon entrance is the helicopter located at 378,959.

The strategy is the same for the Elite mode with the major difference being Hangbui Jarl's health is 149k HP and damage dealt is stronger.

Charged Hack – Interrupt or silence whenever possible
Deep Calling – Move out of black AoE ground effect
Mjolnir’s Echo – Interrupt or silence whenever possible, otherwise let tank re-establish hate

Charged Hack – Significant magical damage done to the tank (highest threat target), can be interrupted
Deep Calling – Places a black AoE ground effect
Mjolnir’s Echo – Knocks down the tank and drops hate, can be interrupted

Hangbui Jarl is surrounded by pools of electrified water, which should be avoided when possible.  The tank should pick up the boss and take him on one of the land edges, with the rest of the party spreading out behind him where they can.

After a crackling sound, the boss will cast Charged Hack, a significant magical damage attack on the tank.  This should be interrupted/silenced whenever possible.

Hangbui Jarl will also cast Deep Calling, which places a black AoE ground effect that players will need to move out of.

Finally, the boss will cast Mjolnir’s Echo, which knocks down the tank and drops hate.  Hangbui Jarl will go after the next highest threat target, possibly the healer, and the tank will need to re-establish hate. This should be interrupted/silenced whenever possible.