How to Kill The Harrow
Alternative Kill Method
Shoot his legs to stagger him. Do this 3-4 times and he will crouch on the ground. When its crouched, run to its back and interact to get the spear.
The Harrow is a bit different from the other bosses since the focus this time around is on eliminating the minions to get to the main boss. The Harrow is a nimble foe that will deal decent damage with his clawy melee attacks up close. Once you eliminate the first wave of the minions, the skeleton-like boss, will emerge and rush at you.
Dodge his attacks and keep your distance while focusing fire on him. Now rinse and repeat with the second wave of the minions until you’re able to put down The Harrow for good.