Dark Rune Guardian

Dark Rune Guardians are adds for the Ulduar boss Razorscale that spawn during the opening phases of the fight.

Heroic mode

 * Melee swing – 7,000-8,000 on Expedition Engineer (ally mob).
 * Stormstrike – instantly attacks with both weapons (10,000 damage). Applies a magical debuff on the target that increases nature damage taken by 20% for 12 seconds. Should be dispelled.

Normal mode

 * Melee swing – ?? physical damage.
 * Stormstrike – instantly attacks with both weapons (?? damage). Puts a magical debuff on the target. Should be dispelled.

Strategies
Tanked by an off tank until dead. The Stormstrike ability should be dispelled.