What exactly are these "super upgrades"? Is it like Colossus - Titan - Thunderlord - Super Upgrade? The one that's the best in the line?
Bone Dragon --> Ghost Dragon --> Dracolich
Devil --> Archdevil --> Supreme Archdevil
Light Dragons --> Green Dragons --> Gold Dragons
Twilight Dragons --> Black Dragons --> Obsidian Dragons
Fire Dragons --> Lava Dragons --> Ice Dragons
Giant --> Titan --> Arch-Titan
These are from Tier 7.
You can also find this in lower tiers:
Archer --> Marksman --> Sniper
Vampire --> Higher Vampire --> Archvampire
Elven Archers --> Master Archers --> Wind Masters
Unicorn --> Battle Unicorn --> Light Unicorn
and so on...
Added after 9 minutes
Yes. In Waterfall's map, Titans become Arch-Titans and gain new abilities, as well as x2 health and damage.
The damage is no longer x2, but x1.5. Those who play constantly complained that the higher-tier creatures were too strong. I nerfed them