3.5-5% Strength for 3.5s on Hit. Stacks 5 times.
2.5-4% Bonus Critical Chance on Chained Hit. Stacks 5 times.
4.5-6% Close Range damage on Repeated Hit. Stacks 5 times.
35-50% Weakspot Damage on Second, Third and Fourth shots in a Salvo.
spam light attacks with tac. axe to apply brittleness rapidly and clear hoards
use columnus for taking out sniper and gunners along with use as a anti elite and boss weapon
save grenades for crushers and boss types (don't waste on bulwarks unless absolutely necessary)
if you want bleeding remove rending strikes and bring it down (but with how the axe behave and how you will use it it wont be necessary to use bleed plus rending strikes and bring it down will boost the columnus dps to the point you can save between 25-32 rounds allowing for later)
use ability to boost dps for weapons and give over max toughness
one point in weapon specialist is all you need to get the job done (the crits for range is gonna help conserve ammo over all and the attack speed and dodge distance for melee is a huge plus)
best use: build range stacks then swap and fire, when the stacks run out (or when in use) pop your ability to give drastic damage boost (also use the ability when swapping back to melee to take advantage of attack speed and dps boost)
note: use ability to support team as usual, just wanted to let you know this build gives it more use overall
happy hunting all