Hiker is pretty difficult in nightmare more, Crash Zone.
I hate hiker, and the lance build in nightmare is also hard, there is a point where too much speed becomes a problem and with the added projectiles you increase the likelihood to crash into them. Crash zone is the hardest due to the enemy that span more enemies, the lance struggle with catching them all. If you get lucky and invest in attack speed perhaps you can pass it. I have seen other people do it, not saying impossible.
My final build is the taser and two torches, you need a snake yes or yes, with that the fire just spread to all enemies and can keep the enemies at bay. Then invest in some defence stats. You could do Wand and teaser too, but you will require one snake, two better, and a silver bullet at minimum. Taser helps the economy a bit too due to the support tag for harvesting.
Ps. This is to pass the hiker in nightmare with no retries, passing with retries albeit painful it is still not super hard.