The build revolves around using the 4th ability to nuke for about 1.5 million every 10 seconds in a big aoe. For fighting collsi I use the mines to get fire damage on the boss and then use enduring legacy to get fire damage procs.

nuke every 10 seconds

Fires a Sticky Bomb forward. The Sticky Bomb attaches to an enemy or terrain on contact.

Detonate the attached bombs.
Damage dealt increases with the number of attached bombs.

Places a Guided Landmine.
Once placed, the Guided Landmine flies to an enemy within its detection range and attaches to it.
If there are obstacles in its path, it attaches to the terrain.

Dashes forward to deal DMG and inflict Knockback on colliding targets during movement.
Interacting with the skill button again or ending movement deals Burst DMG to nearby enemies. Enemies hit by the explosion lose their buffs.
When the skill ends, grants self Madness.
While using skill, becomes immune to Knockdown and Knockback.

/tfd

Esiemo

nuke every 10 seconds