These upgrades will require highest stage achieved to be 1m or higher.
Pirate Turtles : Decrease max boss hp after level 1m
Writing Rainbow: 1b credits per tap/click
Lightning Dogs: 1b credits per kill
Atary: Decrease max cost of Health and Attack upgrades by 1b (1b min)
MES: Decrease premium timers by 1
Admiral 64: 100 pet coin per rift entered
Your Little Horses: Decrease cost of Dark Artifacts by 1000 per (Will have a different price and higher cap than 100 upgrades.)
Next time:Crimson Artifacts!