I've tried many approches, this being the best I think of now:
Stand completly outta his sight at the start and use some cloudkill wand charges to bring that jackass down to Badly Hurt.
Note: I tried to be El cheese, but he still heals even though he cannot see me.
Sidenote, I just told him I'd be back for his scaly ass, to avoid having to fight that other bugger too. I decided to wrap it up b4 leaving though
Ok, your probably gonna wanna know my party and my levels to try and figure out the problem. Oi..
Main Guy- Paladin LVL 9
AC -8
Thaco 7
HP 89
Notable equipment:
Dragonslayer sword
Dragon Scale shield
Dragon Helm
Boots of Speed
Regeneration Ring
Amulet 5% Mag resist
Keldorn- LVL 9
AC -6
Thaco 7
Minsc - LVL 9
AC -7
Thaco 7
Notable Equip
Dragon's Bane +3
Helm of Charm Protection
Yoshimoto - LVL 12
AC -6
Thaco 11 (Bow) 8 (Swd)
Notable Equip
Cestial Fury +3
Heartseeker+3
Arrows of Biting
Hear Dalis - LVL 9
Nothing really, Using him for Aerie Romance, but his usefullness is casting some Magic missles, otherwise he's useless.
Aerie - Lvl 9/10
Thaco -5
Casts M.M. 4 times then Heals.
Notable Equip
Ressurection Rod 10 Charges
Cloud Kill Rod 7 Charges
Pretty much it's like this.
General Plan 1.
I surrounded him with summons and spread my GUYS on 3 sides to avoid getting nailed by a breath all at once. My summons are easyly dispatched and I hack away while whipping spells like mad at the damned thing. Used Aerie to heal and resserect Minsc and Keldorn, Each character can take a full breath aside from Aerie and Hear Dalis.
Best Result :
Badly Wounded.
Plan B.
Stood outside his range and used cloudkill rod twice, then rushed him to find him near dead. He still pulled off the healing even with me at full health pounding him AND hitting him. Got killed. Dammit all..
Best Result - Near Dead/Barely Wounded (Depends on when I got killed or if he pulled off healing...)
Plan C
Used up ALL 7 charges of Cloudkill rod, result no different then above.
So now I ask you. How's the best way to kill this ****ing thing. I've done EVERY temple quest trying to get into the radiant heart, this being the one to trigger my testing. Plus I want that Holy Swd...
I had way less trouble on the Unseeing eye, and that was not even using the rod to cripple him ( I forgot I had it when he came around the corner, still no deaths and Minsc molested the thing.)
I'm just shy off a level with pretty much all my chars too, but I doubt one level will make a huge difference.