Beasts

General:

• The boss has a cleave attack. If you know you die easily, stay under the ur-draug's tail for normal phase and avoid standing anywhere near the tank at end of Rending the Veil (blue phase) until aggro is re-established
• Pick a rock pillar as your group-up spot for blue phase.
• During Rending the Veil (blue phase), huddle behind the rock and keep it between you and boss
• If boss targets your rock, tank should pop a defensive cool down, grab aggro and try to prevent rock destruction.
• If you are spotted by the boss during Rending the Veil, he may cast an attack on you that prevents you from moving and that will cause a big drop to your HP (it may kill you!)
• In the final phase where the Ur-Draug heads to the Center of the area he will cast "Extinction" which is an area based AoE. You can avoid the cast by hiding behind a still standing rock.
• E14+: Team members will be affected by the Maddening Melody during the "blue phase". Make sure to keep sufficient distance between eachother to avoid spreading the effect. Overlapping circles also do more damage to players. 

What the Tank needs to know:

• Dodge the casts of "Slam" by Ur-Draug. This is a cone, so position yourself so you can easily run out of it.
• Keep your back to a wall so "Cosmic Gaze" does not throw and damage you
• Do not interrupt "Cosmic Gaze"
• Be ready to grab aggro asap if the boss target the rock you and your team are positioned behind during "Rending the Veil"

What the Healer needs to know:

• Cleave attacks will kill you.
• Heal from behind or side of boss
• If the boss targets the rock your team is hiding behind, be ready to throw cleanse for people immobilized by boss
• E14+: The Maddening Melody effect will affect random group members during the "blue phase". Be ready to heal several group members at once. 

What the DPS need to know:

• Ur-Thing adds will spawn during Rending the Veil phases. They are Deep Ones, and may wander by the rock you and your team are hiding behind during this phase. Burn them down quick, but stay hidden from the Ur-Draug.

To help your team mates even more, why not make use of the InfoCards for this Boss:  

• Polaris 6: e1 - Ur Draug