Astlibra Revision Boss 14: Wyvern (Solo)
1DO NOT BRING SHEERO WITH YOU DO NOT BRING SHEERO WITH YOU DO NOT BRING SHEERO WITH YOU!!!!!!!!!
Well not if you're going for completion anyways because if you bring her along she will help you in this fight and throughout the dungeon but the next boss will permanently kill her, and also you'll miss out on a secret boss which means no achievement for you. (CORRECTION THERE IS A POST GAME FIGHT AGAINST IT SO YOU CAN STILL GET THE ACHIEVEMENT BUT YOU'LL MISS OUT ON A COLLECTIBLE)
Anyways Wyvern
Difficulty: 8/10
By far the hardest of the dragon bosses so far because it actually moves... in fact it moves a whole lot. Anyway it has 4 major attacks because it's body doesn't do contact damage. It has purple paralysis breath that it will aim at your direction and pelt you with, Ice breath which it drops like little bombs to be area denial, and a wing slash where it closes the game and does a lot of damage... oh it also has poison scales where it'll chase after you while doing a bombing run that will poison you meaning if you get hit by it you're gonna be on an 80 second time limit to take out the boss and that's probably not happening with it's fairly large health bar. Bring at least one antitoxin just to be safe because if you get poisoned that isn't a health loss that's a doom counter.