you can’t level a costum upper than the vanilla hero.
if your Leonidas i si 3-70, you won’t be able to level their costume up to 4-1
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for the C2, your don’t need the C1 costume to be leveled up.
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Yes, you have to ascend 3 versions to get all the bonus.
If ou ascend only thé original + one costume you’ll get only thé normal bonus (+5;+5;+10;+5%)
Then each Time that you get one level of thé second costume ( I mean one of thé 4 level) you’ll get something liké 2% more on each stat ( double on HP, nothing on mana)
Finally, when you reach 4-80 on both costume you’ll get full bonus.
But you Can LB only thé version that you need (+ thé original of course)
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This works only if you don’t plan on embleming or LB’ing the hero. Otherwise the vanilla version needs to be at 4.80.
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Yet no one answered the question about the costume bonus. You need to level up to max level (4.80 for 5*, 4.70 for 4*) both base, C1 and C2 to get the maximum costume bonus.
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Thanks, Everyone, for contributing to the discussion.
I have the answer & have shared it below for everyone’s benefit. Screenshots shared after the text
Example:- I have C2 Leonidas & wish to use the C2 version.
To get full Costume Bonus, I have to -
- Level the base version to 4.80. If I wish to LB any of the costumes, I need to LB this version to 5.1
- C2 version, I need to level to 4.80. If you wish to LB, LB & level to 5.85
- C1 version, I need to level all the way to 4.80. I don’t need to LB this version as I intend to use the C2 version
So, in synopsis, like many have advised above, we need all versions @4.80 for full Costume Bonus.
Regd LB, you need to follow 1 & 2 or 1 & 3, as you wish
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Did I miss why Altlantis 4 stars don’t get the boni like the 5stars, both lb1, maxed out of course. Double checked that my lb/maxed out amoenna is the same as triton. Sorry if that has been already addressed 
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It was listed as a part of the v.58 Big Balance Update. 5* heroes get a buff to costume bonus. That’s what we know for now, who knows what changes will come later.
If you want to know why, one would assume they are widening the gap between old heroes and new, and 4* to 5*. With the intro of Alpha aethers, 4* heroes and classic 5* were too competitive. No reason to spend money in summon portals.
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I think… Because. I’d like the s2 4* to get a better costume bonus, but no… So ok.
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I will try to update the OP based on latest balance update later today.
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The OP is adjusted with the costume bonus related balance update changes.
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I have noticed a small issues:
- Challenge Festival Epic costumes still have 5%/5%/10%/5% costume bonus.instead of higher as the Legendary costumes.
- Morlovia Epic costumes still have 2%/2%/4%/1% costume bonus
I have performed these corrections.
Please let me know if you notice any other problems.
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@PlayForFun
I think now with Season 4 they have 8/8/14/5 in costume bonus
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The Health bonus is just 13%, based on Beta + my calculation
But thx for the reminder. S4 costume binus is now added to the OP.
Sorry, that was actually a mistype 
But the 1% extra atk/def is real
Thank you again for your great work!
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@PlayForFun I know you have more than enough to do, so sorry for adding on the pile, but just a reminder on the update of costume bonuses during august
Valhalla now is 16/16/28%
Underwild now is 13/13/24%
Challenge heroes now is 17/17/30%
Thank you again for all your contributions
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I will do it later today.
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Time to update CB for legends 2017/2018/2019 too.
When you have time. 
Yes, I will do that too in a few hours.
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I have updated the costume bonuses with August and September balance updates.
As we have lot of costumes now. I have collapsed the Affected heroes sections.
The information is still there, but I think it is easier to scroll down to the proper costume bonus category.
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