Hodir is one of the boss encounters in Ulduar. Players are able to fight him but not kill him. His loot is distributed through a frozen chest in his chambers.

Adds

There are NPCs locked in the flash freeze which may help you.

• Battlepriest : Leftmost. Horde: Battle-Priest Eliza, Alliance: Field Medic Penny. Casts: Smite, Greater Heal, Dispel Magic.
• Moonkin : Front of boss. Horde: Tor Greycloud, Alliance: Ellie Brightfeather. Casts: Wrath and Starlight.
• Shaman : Right. Horde: Spiritwalker Yona, Alliance: Elementalist Avuun. Casts: Storm Cloud. Fight in melee.
• Mage : Rightmost. Horde: Veesha Blazeweaver,Alliance: Missy Flamecuffs. Casts: Conjure Toasty Fire, Fireball. She can remove Flash freeze from other NPC and players very quickly.

Strategy

Upon the start of the encounter, players need to keep moving because of the Keristrasza-esque aura that stacks up frost damage the longer you stand in place. Moving, strafing, or jumping removes a tick per second. For example, if a player stands still to collect five stacks, not all of them are removed upon moving.

Hodir also randomly roots members of the raid. Anyone around the target within a 10 yard radius will also be rooted. To counter this, priests can use Mass Dispel, or Paladins can individually Hand of Freedom other players.

Icicles fall from the ceiling and will hit players in the raid if they do not move away from them in time. They are visually cued by snowflakes pouring down before they land, also if you have Projected Textures on in visual options, there will be circles on the floor.. Anyone hit by them takes 12000 frost damage and gets knocked back around 30 yards if they are not rooted.

Periodically Hodir gains a self-buff called Frozen Blows. It reduces his physical damage, but in turn buffs frost damage to his attacks (up to 40000 unresisted). While hodir has the Frozen Blows buff he also deals 4,000 frost damage to the whole raid every 2 seconds, so healers will have to be prepared. The frost resist tank needs to watch for the emote tied to this and immediately taunt him. Healers also need to be paying attention for the emote to switch targets onto the new tank. When the buff wears off, the original tank must taunt back immediately and the healers must switch back right away again.

When Hodir starts casting Flash Freeze, two icicles queue up to fall. These specific icicles create a mound of snow which can protect everybody from getting frozen during the fight. To avoid confusion because other icicles may be falling, the circle projected on the ground is much larger than the other icicles. Get near the icicles but not in them and you will have no trouble getting onto the mound of snow and continue. Anyone who is encased should be broken out immediately before returning to the boss.

All in all, this fight is nothing more than an endurance test. Avoid taking raid damage from Biting Cold and icicles, and definitely do not be caught on the ground during a Flash Freeze.