Examples of how to conduct complex battles (detailed turn by turn). Everyone must read this!

You can also capture the crypt behind the swamp using a different strategy. An army of 20 lizards, 46 simple gnolls, and 3 flies. The hero is Tazar, level 1, with losses of approximately 6 gnolls and 1-2 lizards.

Deployment: fly, lizards, 1 gnoll, fly, 44 gnolls, 1 gnoll, fly.

Round 1:
The first fly flies towards the vampires, the second fly flies downwards, positioning itself 4 squares to the left of the zombies. The third fly positions itself above the second.
The vampires kill the first fly while remaining in place. The lizards wait, and the witches kill a gnoll. The remaining gnoll moves to the eighth row from the top, on the left edge, as bait for the vampires in the next turn. The gnolls wait. After the computer makes its move, the lizards shoot at the witches, and the gnolls attack the skeletons but don't kill them.

Round 2:
Two flies occupy the 7th and 8th squares on the left in the second row from the bottom. The vampires kill a gnoll. The lizards shoot at the witches (~5). The witches attack a fly. The gnolls finish off the skeletons, moving to the 3rd square from the left in the second row (important). The zombies crawl along the bottom row.

Round 3:
With a healthy fly, move to 4 squares to the right of the zombies in the first row. The damaged fly flies to the bottom left corner, where it is finished off by the vampires.
The lizards move upwards and to the right. The witches and zombies move towards the fly.
The gnolls defend.

Round 4:
The remaining fly flies to the 4th row from the bottom, on the right edge.
The vampires fly. We shoot at them with the lizards; there are 9 vampires. The witches attack the fly. The gnolls wait for the zombies to move, and then we kill the witches.

Round 5:
With the fly, we fly to the left and don't touch it until the vampires are gone. The vampires fly. We attack the vampires with the lizards and the gnolls; there are 4 left. The zombies make their move.

All remaining rounds:

We attack the vampires with the gnolls to prevent the zombies from reaching us. We move the lizards away. The vampires will attack the lizards. Then, we lead the zombies with the fly and finish them off with the lizards.

Result: 18-19 lizards, 1 fly, ~40 gnolls!

By the way, using a similar tactic, you can solve Anton's quest without losing any vipers or lizards. Army: 2 vipers, 20 lizards, three mosquitoes, 2 simple gnolls (to make it more challenging). Tazar, level 9, with expert armor, skills 2-9-11.