Tinkerer Gizlock

Earth Song Falls
The waterfall descent and the Scepter portal lead into the inner caverns. Take the side passages for Tinkerer Gizlock and Landslide before committing to the final lake. Keep pulls on the cleared ledges, and leave enough room behind the tank to recover from Landslide's knockback without falling away from the group.

Tinkerer Gizlock
Elite HumanoidGizlock makes the group separate his frontal Goblin Dragon Gun from Bomb targets while keeping beast pets from fleeing into uncleared tunnels.
Abilities

Goblin Dragon Gun
Keep the tank alone in Gizlock's front and move everyone else out of the Dragon Gun cone.

Bomb
Bombs all enemies in a selected area, inflicting Fire damage.
Spread out and leave the bombed area rather than sharing the Fire damage in one cluster.

Flash Bomb
Causes all Beasts in a 5 yard radius to run away for 10 seconds.
Flash Bomb frightens beasts. Keep beast pets' surroundings clear so a fleeing pet does not run into another pack.

Shoot
Shoots at an enemy, inflicting Physical damage.
Distance from the Dragon Gun does not prevent Shoot damage; stay within the healer's reach while spreading for Bomb.
Tank- Point Goblin Dragon Gun into cleared space away from the group. Avoid rotating Gizlock across the healer while repositioning out of Bomb.
Healer- Heal from outside the Dragon Gun cone and leave room around yourself for Bomb. Watch players taking Shoot damage even while they are outside the cone.
Damage- Stand behind or beside Gizlock rather than in the Dragon Gun cone, and spread for Bomb. Keep beast pets away from uncleared side passages because Flash Bomb can send them fleeing.