- Use summons - fire elemental works wonders.
- Make sure you set everything on fire.
- Have your tank stand in fire / electricity so that if the boss does the warp attack, it sets itself on fire / stuns itself.
- Taking out the archers & bomb is far more important than the wolves.
- Opening with a small fireball will wreck a lot of the adds
- Buy a few scrolls from vendors
But yes: the lighthouse fight is one of the hardest in-game at the level you reach it.