Ok. Lets compare UEF and Seraf. nano-regen ACU upgrade
UEF: 800m/24000e, +1500hp, hp regen +10->+50 (boosts regen +40)
Sera: 1800m/56000e, +2000hp, hp regen +10->+70 (boost regen +60)
So WHY does it costs so much?
Sera pays 2.25x of UEF regen's cost, but gains only +33% hp and +50% regen boost relative to it.
This kinda sucks, explain me please what balance team thought about when decided to write these numbers