Razorscale in flight
: When in the air, Razorscale will drop a blue fireball onto an area of the ground that deals about 7k (on Normal) and 9k (on Heroic) damage per second to players sitting within the area.
: When in the air, Razorscale will very frequently throw Fireballs at individual players, dealing about 12k damage on Heroic.
Chain Lightning: Dark Rune Watchers that exit the mole machines while Razorscale is flying can Chain Lightning, which increases damage as it hits subsequent players. The raid should be spread out to limit the punishment from this ability.
Whirlwind: The Dark Rune Sentinels that appear as part of some of the Mole Machine packs have a Whirlwind ability that hits players around them. Lightly armored players should stay away from these mobs.
: 17500-22500 frontal cone fire damage ability.
: Knocks back all players within 35 yards. Some players at maximum range should be able to avoid this ability.
Razorscale permanently grounded
He has the two normal "grounded" abilities and adds:
: Increases fire damage taken by all players (1500 on Heroic, 1000 on Normal); applies in an infinite-range AoE around Razorscale periodically. This forms a "soft enrage" mechanic for Razorscale's ground phase.
: This debuff stacks on your tank and will eventually kill him.