What is the door nade trick?

Gather the zeds into a big group, throw a healing grenade at the edge of a door, run through and close it; the zeds in the gas die quickly, reportedly over 90%.

How does the author damage Hans?

Primarily with healing grenades, which poison him; the author says each health stage can take around an hour, with the last stage taking longer.

Perks & Classes

KF2 Medic on Hell on Earth: Door Nade Trick and Boss Tips

A Field Medic guide for early-access Hell on Earth by a level 22 player. Treat the numbers as the author's own early-access observations; for a modern route see the Field Medic HoE guide.

Playing the Medic on HoE

Healing allies is your job, but on HoE the medic also kills with grenades:

Run around the map and gather the zeds into a large group.
Throw a healing grenade at the edge of a door, run in and close it. The author reports over 93% of zeds die in seconds, depending on how long they stay in the smoke.
Keep looking for ammo packs: each gives +1 grenade, and grenades are basically your main killing tool.
Between door tricks, sprint backward and aim for the head to finish waves faster.

Perk picks

Level 5, Healing Surge: +20% health.
Level 10, Combatant: free starting body armor and a 60% armor discount. Very important because dosh is slow and used fast on HoE.
Level 15, Regeneration: slow health regeneration through nanobots. Slightly underbuffed: the first hit is negated by about 2 damage, then roughly 2 health every few seconds.
Level 20, Vaccination: your healing grants teammates extra max armor and temporary bloat bile resistance. Grenades restore much armor; the alt heal adds about 7 armor per use. Save grenades for when they are really needed.
Level 25: up to you.

Heavy zeds

Scrake: when he swings, step left then backward so he spins and attacks the air to your left, missing every attack. Do this inside your healing gas.
Fleshpound: kite him around an object; when he swings forward, move to the next edge of the object. Not guaranteed, but it works almost every time.

Hans

The author calls this the very hard boss: expect hours or days of attempts.

Always break line of sight with his bullets, which hit hard (about 29 HP per bullet through armor in the author's tests). Run around corners as soon as possible.
Your main damage is healing grenades, which poison him. Reportedly this takes about an hour per health stage, and the last stage is longer.
It takes him about 1.9 seconds to open a closed door. After running through a door, close it: this is crucial.

FAQ

What is the door nade trick?: Gather the zeds into a big group, throw a healing grenade at the edge of a door, run through and close it; the zeds in the gas die quickly, reportedly over 90%.
How does the author damage Hans?: Primarily with healing grenades, which poison him; the author says each health stage can take around an hour, with the last stage taking longer.