For the impatient and people who prefer this guide as a video, just click on play.

Note that there is no narration, just a demonstration, how it's done.

Some patience on grinding the orcs.

Playing the level 1 "On the Edge" on War Mage difficulty. It is possible to do it on Nightmare, but watch out for these pesky Gnoll Grenadiers...

You need the following things in your spellbook:
- (most important) barricade trap, cost reduced to 600
- tar trap, preferably cost reduced to 300
- arrow wall trap / acid wall spitter trap, preferably cost reduced to 600
- spring trap, preferably cost reduced to 450

Wave 1:
Block the normal access to the exit of the level on the edge of the map with your barricades and barricade the train track from the northern side.

You will not be able to purchase the final barricade now. If you can afford the tar trap after putting down the barricades, set it at the northern edge left of the train track.

Wave 2:
Put the last barricade near the tar trap down, so that the orcs have no other way to go through the tar trap. If you did not have set it up due to cost, do it now.

Go to the other side of the cave and put up an arrow wall trap to catch pesky survivors. If you have the coin for putting up one or two barricades, wall of the western side of the train track, you probably can setup one to three of them, they're enough.

Wave 3:
Put a second arrow wall trap at the edge near the exit and/or a spring trap, set 1-2 barricades more alongside the train track, but let an opening for the orcs to slip by.

Wave 4:
Build whatever you want :)

After winning the map exit directly to the main menu, do not click on Retry.

Notes:
- repeat the same level until you get the achievement, you will have to do it about 8-12 times.

- sometimes, the orcs begin to destroy the barricade next to the tar pit, just kill him off with your weapon.

- Orcs surviving the encounter with the lorry always at the brink of death. You need two damaging traps for reliably catching them all.

- on nightmare, you have to factor in the Gnoll Grenadiers.