Huzzah!
I finally beat this darn Adra Dragon and boy did that feel good!
Granted I came back after beating White March 1 & 2, so it was probably a bit lopsided maybe? Adra wiped my party once after coming back, then I tried one more time. Even at max level though, I was able to beat Adra, but I'm still banging my head against a wall trying to defeat the Alpine Dragon. Llengrath's two dragons also totally demolish me even at max level.
To defeat the Adra, I followed similar tactics as described back on page 1 by @Logos. My party consists of all characters obtained ingame + my own player (Monk). I took Eder up the left hand side, drew aggro and sent the rest of my party to deal with the Xaurips as quickly as possible. Then I used Aloth to get in some lucky Paralysis scroll hits, buffed up team to reduce "Terrified", and most importantly used Concealhaut himself to weaken her (and also some of Aloth's spells that cause weakening, of which Adra is not immune to).
Also, if you're lucky the Adra Dragon will accidentally kill its other two helpers that come over to assist. The Adra uses its AOE wing crushing attack (100 or so damage) - I already forget what they are, they look like Delemgans, but they got annihilated with just one Wing crush with Eder still standing.
Eder: Stocked Major Potions, Major Recovery
Aloth: Paralysis Scrolls, Revive Scrolls
My Main PC: Concealhaut's Skull, Major Potion, Major Recovery
Others pretty much the same: Maneha, Durance, & Pallegina
