First thing I read on Ulduar

[JohnnieRat]

Hodir

    * HP - 35,699,200 (Heroic Mode)
    * Normal melee attacks for 25k damage on a well-geared warrior
    * 8 Adds trapped in blocks of ice are around him, you can break the blocks (40,000 HP) to have them help you. They will randomly drop Toasty Fires throughout the fight.
    * His aura called Biting Cold is using the same mechanics as Intense Cold during the fight against Keristrasza, it stacks up and damage increase over time. Moving will reset the stack. (This is also affected by the Toasty Fire, see below)
    * Hodir casts "Flash Freeze" (9 seconds cast time), a spell that freezes the entire raid in blocks of ice.
    * He will randomly spawn Icicles, they will create patch of ices on the ground as they drop. Standing on the ice when Hodir casts Flash Freeze prevents from being encased in a block of ice.
    * You can also prevent Biting Cold and Freeze by staying next to a Toasty Fire in the room, however it will be removed by Flash Freeze. Warms nearby friendly creatures, preventing the effects of Freeze and Biting Cold, and increasing Spirit by 4.  Toasty fire can be extinguished by falling ice or powerful frost magic.
    * After Flash Freeze, Hodir will gain "Frozen Blows" and deal 70% reduced physical damage but each attack deals 40,000 additional frost damage.

Read it on MMO-Champion... So 25k normal melee attacks on well geared tanks?! I never thought a raid boss would ever be a ret pally.