Hotfix 3 (v12.08.2 server-only fix)
Balance
Ogre 
Removed mana on attack,
Added 1.1 mana regen,
Strictly a buff, particularly where Ogre is running instead of attacking.
Hotfix 2 (v12.08.2)
State of the Meta (dev note)
Based on preliminary data, the recent nerfs to early game all-ins moved the needle on key metrics:
Average end wave: 14.1 → 14.6
Early game save rate: 27.5% → 24.7%
Early game power send rate: 35% → 33%
This hotfix patch’s nerfs to early game power mercs will also help. We’ll continue to monitor and make changes as needed.
Fighters
Balance:
Pipsqueak
DPS unchanged
Damage decreased by 17%
Attack speed increased by 21%
Now has a smoother threshold distribution on early game waves (previously had an unexpectedly bad threshold on wave 3).
Lumerian
Attack speed increased by 1.4%
Now maintains stacks of Trium of Power after reviving from Guardian Angel
Tip: Lumerian shines with a strong tank frontline and attack speed buffs
Mercenaries
Shifting power from cheap power mercs to mid-priced ones.
Robo 
Attack speed decreased by 2%
Brute
Health decreased by 2.3%
Imp
Health decreased by 1.4%
Attack speed decreased by 0.5%
Safety Mole
Safety Aura: Damage: -12% → 12.5%
Pack Leader
Leadership Aura: Damage reduction: -18.5% → 19%
Ogre
Damage increased by 1.1%
Small buff, as Ogre is performing decently but getting crowded out by cheaper mercenaries.
Centaur
Health increased by 1%
Damage increased by 2.2%
Classic
Giga Mercs
Safety Mole and Pack Leader auras no longer scale, as these abilities were breaking the game
Hotfix 1 (v12.08.1)
Balance:
Ogre
Damage increased by 4.4%
Rage: Lifesteal: 20% → 25%
The Ogre rework came out a bit weak.
Lumerian
Attack speed increased by 3%
Still monitoring, but for now, a small buff to help Lumerian ramp faster.
Fiesta
Gold scaling: 8-50 → 8-48
Fiesta is too strong now with last patch’s changes to wave 1 leak gold. We like the dynamism Fiesta adds to the early game, so we’re shaving off a bit of mid to late game power. Will continue to monitor.
Fixes
Fixed eco penalty falsely triggering for dual builders