The stat curve is not linear
But
The mono punishment is to prevent runaway Event Hero mono teams
Click for Simplified Damage math
Until the soft cap is reached, using the simplified damage model,
Event hero mono =
1.279 x non event mono damage
Using simplified Sturdiness model everything cancels back down to x1.2 Sturdiness ( not actual number in game )
1.279 x 1.2 = 1.5348x Total Damage Output for Event mono team versus non event mono team
I do not know how the stacking penalty works
Does each hero get -10% Attack stack ( 0% to -40% )
Assuming -40% mono penalty
0.92088 TDO for Event mono team or -8% effectively versus a non event mono team ( when non event mono team is fighting a non event enemy like a titan )
Notes
Click for notes
Before soft cap
Non event mono
(5*1)^1.35= 8.78
Event mono
(5*1.2)^1.35= 11.23
Event mono 11.23 / Non event mono 8.78 = 1.279 x non event mono
Simplified Sturdiness
( DEF * 2 ) + HP
Since everything multiples by 1.2 for event heroes
( ( 1.2 * DEF * 2 ) + 1.2 * HP ) / ( ( DEF * 2 ) + HP ) = 1.2
FIn