The Keepers of Ulduar: Freya

For Freya, the fight is the adds itself and it is generally chaotic. Below are some tips:

• Chop the tree when it appears as Lifebinder's Gift is bad.

When Freya Summon Allies of Nature, defeat one of the following waves of adds.

• Defeat Detonating Lashers one at a time, as they Detonate when they die. Avoid AOE unless nobody nearby. Lashers will attack random players and don't have aggro table.
  
• Stay under mushroom and defeat Ancient Conservator.
• Damage Elemental Adds (Ancient Water Spirit, Storm Lasher, Snaplasher) down to 30% health respectively and defeat them at the SAME time.

• For phase 2, just stay away from green root.

Blackwing Lair

Blackwing Lair is still quite deadly in recent run today, as a lot of players are defeated by Shadow Flame during the following encounters: Firemaw, Ebonroc, Flamegor and Nefarian. The dots are still powerful even if the players are level 80. Luckily, this can be avoided easily by wearing Onyxia Scale Cloak or learning the fights.

Lastly, although the attunement has been removed, completing Blackhand's Command will give you access to orb that can teleport to Blackwing Lair.

A Void Dance

A Void Dance is one of the difficult achievements, not because of the encounter but the chance to meet the boss with the right group.

At this stage of the game, I guess most PUG can handle this pretty well. AOE spells should be avoided so that sentries are not killed accidentally. This has happened a couple of times for earlier PUG groups.