The trick to the Bomb King is when he gets to 3/4 health it runs off at that point & casts renew. Just as he goes to do that it him with quickenings. A chain of 7-8 should be enough. Buy some hankerchief too he has some attack that causes oil which turns his near harmless fire attacks it disaster.

As far as the Zodiak Spear goes I'd like too know where it is too