I’m pretty sure we can get a formula to figure out all the stats. I’d love to see the info you’ve collected so far to help prove out my theory.
I’m not quite done with tracking every toon, but this is a pretty good cross-section. It includes every trait, every role, free, promo, legacy, Gen 1, and Gen 2. Note that the atk, def, hp all go up by a consistent amount but the overall increase varies because anyone with a relatively high attack gets more of a boost. When I’m done entering all the veteran’s stats, I’ll share it out along with a formula where you can enter a number of promotions and it will spit out estimated stats.
Also, note that it’s not quite right to say “with 20 rings” and “with 30 rings”. It takes more than 1 ring to raise some promotion levels. That’s what I need help with - what gear / rings is required at each level? Because that’s the unknown, and it may vary from toon to toon. If anyone wants to help figure that out, I’ve got a Line room going to collect screenshots. Most likely, we’ll find a pattern; I’m not there yet.
Bottom line: attack goes up by about 40.5% between unpromoted and maxed veteran levels, defense goes up 30%, and HP goes up 24%. Plus, attacking is key to the game - you can’t score points in war, raids, or arena without successful attacks. I’d suggest: promote your attacking toons first, then defense.
Edit: that Elle ratio has to be wrong, I’ll fix that.
Edit2: derp. They changed Elle’s stats after the blog post.