First of all it is a good idea to wait untill Ur party is lvled up to a descent lvl before engaging the big olīred one...
A little tactic around Firekrag...
1. Summons...lots of them to absorb the higher spells, wingbuffet and dragonbreath!
2. never place all members of Ur party in the same spot...spread out...generally I tend to surround the dragon!
3. The spell Lower resistance is good (U could cheese it by using the priest spell magic resistance...it actually lowers it more)
4. fire res. potions and equipment (dragonslayer longsword, red dragon helm etc will boost U against Firekrag...at max resistance 127 % U heal when struck by fire)
5. Remember NO fire will hurt Firekrag...but Acid, ice and the like are good
6. Haste, protect and strenghten partymembers and beat the sucker into a pulp
------------------------------In the end he always goes down.
A good thing though is to lower his magic resistance and then hammer him with spells while Ur fighters and summons take him on...
A good place to look it up is Dundee Slayterns tactics on dragons but I donī+t have the link...with a little luck heīll read this post and drop it for U
Spawkie
Good luck...heīs a tough one the first couple of times