Gladiator

20 - Combat units + prayer

Here, you probably need to provide funds for purchasing units - otherwise, it becomes pointless, as there won't be enough to buy units and progress further.

Added 36 minutes later

The following heroes are banned on the map:
- Heroes: Jelu, Dragon, Nela, Tazar, Mephala, Kilgor

Perhaps these should also be banned:
Mutare and Mutare Drake - specialist in dragons (All Dragons receive +5 to Attack, +5 to Defense)
Xeron - specialist in devils (Devils/Archdevils receive +4 to Attack, +2 to Defense, and +1 to Speed)
Lord Haart - specialist in Dark Knights (Black Knights/Death Knights receive +5 to Attack, +5 to Defense, and +10 Damage - the bonus is much greater than Tamika's)

Possibly some of them are already banned, but they are not on the list. But both Mutares definitely spawn.