Haldyn

Haldyn is a male Redguard battlemage in, found in Japhet's Folly Towers on the island called Japhet's Folly.

Background
He is the leader of a pirates clan which call themselves The Blood Horkers, who raid the coast of Skyrim. Their attacks have nearly shut down the East Empire Company office in Windhelm.

Quests
During the quest Rise in the East, the Dragonborn is requested by Orthus Endario (the East Empire Company's representative) to annihilate Haldyn and his Blood Horkers.

He is a powerful magician, located at the top of the main tower in Japhet's Folly, who uses Lightning Bolt and Fast Healing. Anti-shock potions/enchanted apparel can be very helpful. Given that Haldyn relies purely on magic to fight, the Staff of Magnus can be especially useful for draining Haldyn's magicka to the point where he becomes harmless.

An alternative to this is to side-step all of his lightning while keeping your distance, so that you can safely attack him without him fighting back. Be sure that he is fully out of magicka, as he can occasionally pause during his lightning onslaught.

If the Dragonborn wishes to choose a more a stealthy approach (and has a high enough sneak level), they may simply sneak behind Haldyn as he leans over his enchanting table, and stab him in the back. It is recommended that the player dual-wields daggers with the 15x damage Assassin's Blade Perk (powerful enough daggers should kill him instantly) if they are ill-equipped to defend themselves against the barrage of lightning that Haldyn sends their way once he detects them.

Loot
Haldyn wears a full set of Steel Plate Armour (minus the helmet) and also carries horker meat. In the room where you find him, there are various pieces of minor loot (soul gems, jewellery, and gold), a scroll/tome, and a chest containing some level-dependent armor.

Trivia

 * The horker meat that Haldyn carries is most likely a reference to the name of his band of pirates - the Blood Horkers.
 * After Haldyn is killed, you may randomly meet several (hostile) Blood Horker members, who yell "This is for Haldyn!" on sight.

Related quests

 * Rise in the East

Behind the Scenes

 * Haldyn is the author of Blood Horker Orders.