Second run through on master on alt account...
Missed: 8 X10 (2x rounds 1-9, rest on the boss)
almost died on round 5 with one double strike took 2 rounds to kill
One shotted Echidna
Finished round 10 in 16 turns...
So 28 turns from start to finish.
Almost certain my team just isnt high enough level to deal with legend, so not going to bother, but looking ahead at the other ancient dragon fights... blue looks super fun. Or super fast at least... if it takes you more than 6 turns, you die
Blue has super high armor (403336) but low HP (37206)... Looks like I am bringing a lvl 77+ sea diety abyss neptune along... (1241 attack requirement). He does not have the same ability as the others... you can poison him and delay him... so High level Neptune + Anubis leader with echidna sub and not sure what else just yet to fill in the rest.
Green is pretty straightforward 6612(after 50% reduction special attack) 5511 Regular attack on 2 turn timer... Yawn. Round 5 is tougher than him.
Also, the ancient RBG dragons have a 9 turn (5 at max) 25,000 dmg AE rip. Biggest downside is: 60 teamcost! Not sure where the Dark and Light versions come from...
Hrm... Hera will be a cakewalk, the other 2 Wheat? Dragons should be too. That leaves one cycle of mechdragons (on legendary or master or whatever), "legendary" dragons (easy...), Valk Dungeon, and Zues as the special dungeons I havent 0 stoned. Whats after that?