#1 - May 16, 2016, 3 p.m.
Blizzard Post
Playing Favorites in Ulduar: A Poll

Seven years ago, Ulduar was the place to be, and teams of players challenged the bosses that came to be known as “Tier 8”. The tokens those bosses dropped and the set pieces that could be collected in exchange for them are still sought after today, as solo adventurers seek to complete sets such as the Rogue’s Terrorblade Battlegear or the Priest’s Sanctification Regalia for transmogrification purposes.

When I think about the main bosses from Ulduar, my fondest memories are of:

Freya
Hodir
Mimiron
Thorim
Yogg-Saron
Other (named in the comments below)
started 13-May-2016 ends 23-May-2016