WARNING
If you don't know what the void dragon is don't read any further, massive spoilers ahead!





So I managed to get to the final boss (I know that it's the final boss because I had to google, see below) of the game: the void dragon. Unfurtnetly I can't find any kind of strategy to survive this fight because

a.) You have to babysit Astarte (heal her like there's no tomorrow). That looses obviously APs and these are really rare for that fight anyway.

b.) The void dragon itself doesn't take really damage. I guess he just has like 10k hitpoints or something? My weapons are in the range of 100-350 and normally need a huge amount of APs.

c.) The void dragon spawns everytime mobs which damage my party (or stun them like there's no tomorrow for 3-5 rows) or Astrale.

I even lowered the difficulty to low, but it doesn't help. Ironically on that skill level, in the first round, the void dragon lowered Astrales health to 1 hitpoint or something. Is that as supposed to work? On easy? Did the latest patch change anything which shouldn't?

I googled that there's a "lava core" spell which can help to defeat the void dragon. Where can I find / buy it? I think I looked everywhere already!

Any basic hints would be really cool, thanks!