This is just idea, but if you have some idea to improve this feel free.
Gold boost 
We’re heading in very near future to gold rarity ranks (after R14*) it’s after R18, it would be good opportunity to add instead of skill some kind of boost, things which mods can’t do to heroes but are still important. It would be also good to improve weak hero’s stats or add important stats for them for combat which unfortunately badges didn’t add.
Gold Rarity and the boost
Once player get hero to rank Gold +0 player will have possibilitity to add one-time permanent boost to hero.
Hero’s white to purple skills needs to be maxed and red skill unlocked.
Possible boosts: (each hero have same boosts available)
- 220 Armor negation (hero can’t have more than current level cap + 50)
- 220 Reality negation (hero can’t have more than current level cap + 60)
- 220 Normal crit (hero can’t have more than current level cap + 50)
- 220 Fantastic crit hero can’t have more than current level cap + 60)
- 250 crit damage (hero can’t have more than current level cap + 50)
- 250 Normal prowess (hero can’t have more than current level cap + 50)
- 250 Fantastic prowess (hero can’t have more than current level cap + 60)
- 240 Tenacity (hero can’t have more than current level cap + 60)
- 230 Evasion (hero can’t have more than current level cap + 50)
- 10% Conservation
Guaranteed boosts: (no matter what player choices as gold boost, these will be added to hero)
- +5% Extra HP
- +10% Extra BD
- +10% Extra SP
While player will be deciding which boost to pick they need to remember to not choose a boost which won’t get beyond limit and at last left hero unchanged or take full advantage.
Resources
To unlock Gold Boost player will need 5 gold crystals.
Player can receive 1 gold crystal by completing all daily missions, divisions 6-1 in challengers will also reward gold crystals from weekly rewards.
Player can also find 3 gold crystals from invasion ranks.
Already choosed, but want to change the boost
In case of changing decision player can change boost on hero by paying 10M gold and 10 gold crystals.
Further caps and boosts
After each cap rise all boosts will rise by 1 per increased level cap.
At level 210, so since gold rarity is available player can get 200 normal crit.
After few months and when cap rise will be 230 the normal crit stat will increase automatically and will be 220.
Note: Conservation stat will not change.
Mods upgrades won’t be included to the caps of the boosts but only core and raw stats received from badges.
*After R14 in other PB’s game (Portal Quest) was added G0 (gold +0 rarity).
