Ok then. Converting to MH, just my advices and I repeat, to MH not an assumed mod A B C full of lamer features.
1) Map has paths but no target for Bot.
Solution: Remove the crap MonsterArenaEnd and put the trigger MonsterEnd with the same collision radius and height but placed lower (as a pathnode) not in air, 15000, 15000 and near a pathnode.
2) No healing spot closer to playerstarts, neither far away, battle will do sucks in default MH and also is very poor in ammo.
Solution: add more ammo, use a decent respawntime (12-15 seconds) also other weaponry might help players with different tastes in weaponry. Armors, Shields ?
A kind of weapon right in first tunel almost near starts will be much better to manage an ambush from Skaarjs;
3) Pick a random name (Male, Female, Dog, Cat, Fish, Snake, Pig, any creature) use that name for the TAG of MonsterEnd which will be
bInitiallyActive=False. Use the same name for Event granted by Skaarj-Boss. When Skaarj is dying will launch event hitting End. This one will be active. Assuming we have a huge collision toucheable immediately by hunters, will trigger ending of game.
4) Last point: From Editor use "SaveAs" and name it MH-......unr - pick your name.
5) Optional Stuff:
a) If you need, you can assign another TAG for all those Skaarjs and Even for Boss. Near End, put a HomeBase with the same TAG. If they start to be chickens won't run like mads through map. Will attempt to stay grouped at HOME "guarding" the end. Bot will face them directly in a bloody battle (because you spoke about fun);
b) More crazy things. Place Home between End and tunel. One of closer Skaarj might have order patroling (if you set it). Add 2 or 3 PatrolPoints, setting them is not very hard with a bit of logic, I learned this stuff directly without tutorials. Make a cycle through those 3 patrols. Also you can put an AmbushPoint nearby HomeBase;
c) AlarmPoints for 3 guys from group and others as well placed different making hunter to believe that will be surounded. I think will be happy - can attack in any direction,

;
d) Boss will be Boss or just a bigger idiot ? Modify projectiles with some Rocket type or Dispersion level 3.
If map is ugly at least you can do small tunes to enhance A.I. and a funny battle.
Other suggestions ?