I want to suggest that each Legendary heroes able to change their Version/Counterpart.
only applied to "FROST-ICEBLAST, DAUNTLESS-ELECTROCUTED, POISON-CORROSION, WILD-BURN, RALLY-AURA, SUMMON-SHADOW" Vice Versa. Heroes Apparance Stay the same, but have Different Skill Set (Passive, Battle, Ultimate) as another Version.
Exclusive, Defense & Support CANNOT change their Mode/Version.
I just want some Available heroes to be Synergies well with New Heroes & Generate new Combination of Heroes. Instead of adding dozen of new heroes each season, its also wise to upgrade OLD heroes.
Example: Vicana (Poison) <-> Vicana (Corrosion), Felicity (Wild) <-> Felicity (Burn), Irzillas (Summon) <-> Irzillas (Shadow), and more
NOTE: Who knows if Sharlach (Summon) synergies well as a Sharclach (Shadow) or Jathalea (Poison) will be better as Jathalea (Corrosion). Vice Versa. experiment it yourself.
"HOW TO UNLOCK": Summoning via Heliote Dice
To unlock each version of it, you need to summon their Version/Counterpart.
If we have Sutha (Dauntless) and then summoned another Sutha (Dauntless), its became Soul Imprint.
If we summoned Sutha (Electrocuted), Then you Unlock their counterpart, which you can change his Mode to be playable as Electrocuted.