Talk:Brain of Cthulhu/@comment-24061485-20131017181723/@comment-24013733-20131017222831

If you've a world with The Crimson, you should probably already have The Undertaker by the time you face him (breaking the Pulsating Hearts gets you this weapon). Stock up on bullets, get a decent mana supply (>100 mana, just wander the world at night collecting falling stars). You'll need silver armor (or equivalent) or better.

Hunt for 8 gems of a single type and make yourself one of the staves (links to those are on the Spells page, as I recall) depending on what metals are available in your world -- get the best one you can easily manage. This'll be your primary weapon.

Build row upon row of platform in the large underground cavern in the Crimson. The staff and gun will help you fend off critters the happen across you while you're building. You'll need 3-4 stacks of wood platforms to fill the space. Make them as far apart as you can reach without jumping; this ensures they're just close enough to reach with a single normal jump. You can place a platform every 2 blocks to save having to use more wood than necessary.

Summon the boss either with the Bloody Spine or breaking hearts with bombs.

The Creepers will always flock to wherever the boss teleports, so the easiest way to take them out is to aim straight at the main boss the whole time. Blood Crawlers will come at you occasionally, but they cannot go down through the platforms. Use this to trap them and kill them without getting in harm's way. The other flying enemies in the Crimson are similarly limited, and prior to defeating the WoF, none of the enemies here have ranged attacks.

Basically, just shoot at the main boss's body the whole time with your staff, and keep on the move so that his teleportation doesn't end up with him right on top of you. When you're out of mana, switch to the gun and just keep shooting.

When all the Creeper minions are dead and he's vulnerable, just keep shooting him and keep moving. The platforms give you sufficient mobility to evade him 80% of the time, so use them. Always switch back to the staff when your mana's fully recharged, because staves tend to do more damage than the gun, and they can also hit multiple times with a single bolt if your aim's fairly decent. The projectile isn't quite as fast as a gun, so aim may have to compensate.

Good luck!