Ends of my challenge.
My challenge of complete all tier 6 levels at tier 5 build is ended, so this is the conclusions of it:
Corebound levels sorted by complexity:
1 - Crystal Quarry (Almost freaking impossible) - 8 hours
2 - Icy Hollow - 2 hours
3 - Lost Scrapyard - 1,5 hours
4 - Kinetic Workshop - 2 hours
5 - Beacon City - 1 hour
6 - Desolate Drains (SO EASY) - 30 minutes.
I comleted KW the first one of the all tierlist, so it took some more time.
Most annoying enemies and how hard was the boss:
LS - Scraplash (4/10), Dreadnought 5/10.
CQ - Wiremaw (9/10), Lurkstrider 9/10.
BC - Droneweaver (6/10), Orbital 4/10.
DD - Obstron (4/10), Forgeheart 1/10.
IH - Tetherhawk (6/10), Annihilator 7/10.
KW - Cyclovane (5/10), Striderlord 7/10.
Tierlist made for the 6 tier (geared) locations at lower tier builds.
Almost ALL levels i beat at one same build - Crawler, 3 rangers, 3 overdrive cells, 2 motors, 1 shield and 1 propeller.
I'll answer all your questions if you have them)