Almost the same build I had for beating 2BC:

SURVIVOR BUILD / 25 scrolls

_ Ice Shards VII
_ Boomerang VI (caused poison)
_ Wolf Trap VI
_ Crusher IX

Paired both the Ice Shards and boomerang to the X button.
That alone with the poison was good enough for most enemies.
By the time I got to the High Priest Castle, I had everything slanted towards poison damage.
Plus the Crusher spread oil which raised my Ice Shards up.
When I tossed the trap and crusher together? It was a wrap.
The 3 mini bosses you fight to get the 3 keys in the Castle went down in seconds every time.

I need to learn the timing on that R&B Guitar melee weapon.
I kept seeing it in the store and the hit points were crazy.