For an exemple: Mister leviathan chould come back as an event where he walks around ONE direction in the map and is escorted, incase the leviathan gets to 1 hp, it will enter an unkillable state, and if you bring chompers you can order em to eat the leviathan gaining kermulite per chomp ( backstory is, the leviathan itself is an mining ship from a zerg expedition backing away from the área, it carries the minerals in the abdómen, the compers's bite compresses the biologial matter and minerals in an capsule ( pre-refinery minerals ) being then removed from the refinery ) at total there can be 10 chomps, each giving about 50-100 kerm each, don't forget, the chance is random, and the leviathan is not an easy prey. This will make the ''booring'' upgrading and stail-off phases, as both ships may want a piece of the kerm, and maybe a underfed cruiser can kill it ( luck ) and use the kerm minerals to even the odds ( the leviathan disapears after being chomped the 5th time, with the death animation )
After this Wall of text, time for the protoss part of the deal.
Ok then, so, ive tought hard ( didn't balance nothing of course ) and i had an crazy-wierd idea where an small voidray/Phoenix group w ( yes this is wierd ) an single carrier goes off to mine ( they attack the asteroids til death ) the asteroids, as such, they are an event to make the BCs decide as in:
1. Stay on spot and prevent Ambush by the other bc, or
2. Risk killing the protoss and prevent em from drying out the asteroid fields
Incase the protoss are left alone too long, many asteroids can get mined out and the map resources can get severly deminished, one way or another, one of the BCs will have to deal with the protoss, ( this also makes the miners want to have escorts til the protoss are killed ).
As always, tell me what you think