Hey guys!

I have a big list of all upgrades from the blue/purple/gold summons

All the stats provided and the unbound runes/coins cost of each upgrade, with the total costs also

Summon Cultivation Stats/Cost (Blue Summons)

Summon Cultivation Stats/Cost (Purple Summons)

Summon Cultivation Stats/Cost (Gold Summons)

So firstly let's go with Blue Summons !

So at end you have the full total cost and stats gain from Blue summons

Considering we have only 5 blue summons in the game to cultivate you can multiply the stats/cost by 5x

5x2452 = 12260 unbound runes needed to max all blue summons = 12260 coupons/ingots (if you were to buy all at full price)