Brother Long Legs, or BLLs for short, are an early-game enemy found mostly in Garbage Wastes, predominantly roaming the bottom-most areas of the region and guarding a wealth of Pearls. They have a huge health pool and are difficult to dispatch with combat but have very few senses. They provide a challenge for those who wish to pass through the bottom of Garbage Wastes or those who wish to ally with Scavengers.
Brother Long Legs are large, black bulbous masses, with several brownish-green-tipped tentacles extending from their core, accented with brownish-green X shapes. The number of cores and tentacles they have may vary. In The Rot, Brother Long Legs appear as blue similar to the color of Daddy Long Legs.
SPOILER WARNING: Hunter This section contains major plot details from Hunter. If you have not made significant progress or completed the game as Hunter, then read no further!
Proto Brother Long Legs appear in Garbage Wastes when playing as Hunter. They are a stationary hazard (and as such are unkillable), but can latch onto the player with their stubby tentacles and drag them in, consuming them. The long tentacles connecting patches of proto-growth can be safely grabbed onto like poles.
In the Hunter campaign, Garbage Wastes suffers from a slightly larger infestation. This is because the Hunter campaign takes place at a time closer to when Five Pebbles dumped infected material into Garbage Wastes during his first fit of corruption.
Brother Long Legs most likely have an amount of health too high to be taken out by standard Spears, thus resorting to combat is heavily discouraged. Spears may be used to disable their tentacles, but this alerts them and encourages them to explore the location the Spear came from. It is also time consuming to disable all of their limbs. Additionally, their core remains active even when their limbs are disabled and can still eat Slugcat and other creatures when touched. An Explosive Spear can kill a Brother Long Legs instantly, as long as it hits them in the core. This can be difficult as their limbs may get in the way.
A Brother Long Legs moving through a connection pipe
Stealth is the best way to deal with Brother Long Legs as they are both blind and deaf. They usually patrol linearly around the rooms they spawn in, investigating anything that touches them, thus as long as they are given a wide berth, they are unlikely to notice anything that passes by. It is recommended to not throw anything at them as this makes them head straight to the location it was thrown from.
Once a Brother Long Legs has locked onto a target, it gives chase until it loses the trail, then continue patrolling its room. They are somewhat sluggish in comparison to other enemies but do not have to worry about the rocky and uneven terrain of the Garbage Wastes, meaning that depending on how much their prey struggles at navigating over the terrain, they can catch up quickly. Additionally, they can move through connection pipes, meaning that moving to a different room does not guarantee safety. Brother Long Legs temporarily shut down upon eating other creatures, so feeding them things such as Squidcadas or Snails may provide an opportunity to escape.
Like many other creatures in Rain World, Brother Long Legs vary greatly in appearance, having different numbers and sizes of bulbs and tentacles randomly connected, and even having different shades of brownish-green.
Brother Long Legs and Daddy Long Legs are jointly one of the 10 backer-created creatures.
Brother Long Legs are unable to eat creatures that exceed their own mass, such as Green Lizards or Vultures.
From the Spearmaster's campaign it can be seen that the Brother Long Legs are a descendant of the much larger Mother Long Legs initially dumped into the Garbage Wastes at the time of the Spearmaster's journey.