I still don't think the description on top has enough informative explanation or rightful detail inside the game.
But anyways, as much as I tested it, I notice how wide the map is and the level difficulty for this game is quite difficult, I mean I venture the whole map to look for 3 keys, border to border and by then only 1 key pops out of the entire map, once you are able to find it you will now find a gate that can hopefully enter, there are 3 gates and walking on that regions consumes so much time, if one of the gates you entered was faulty a powerful unit attacks you or the group, or you end up teleporting in an area where you will be attacked by dozens of creeps.
I think the idea is ludicrous unless the map is either small, and the proportion of each objects being triggered in the course has enough stability to begin with, creeps do not spawn but has 90% populated with units so strong that It can kill you quickly, I believe you either just make a trigger where passive creeps spawns in the game if one of those creeps gets killed, the items are so bulky and much of the gear is mostly a "staff" and gives additional armor or damage, how about life points, summons, or some ability that will coupe the player in surviving rather than fighting?
The terrain is too plain and due to plain, its so wide, venturing on each part of the map feeds so much time and looking for the keys is like using a teaspoon to catch fish on the ocean.
Anyhow, the only suggestions I can give to make this map proper is either give less map size, reduce level difficulty, and items that can help out the player's unit to survive.