Monster Kelp

Monster Kelp is a stationary predator in Rain World often found around bodies of water. This creature is a significant threat that can quickly kill an unprepared slugcat, but with the right tools can be taken care of easily. It is found naturally in the Drainage System, Subterranean, Shoreline, and Shaded Citadel. They appear like long, leafy stalks with highlights of red or green on the end of the leaves. Kelp only senses movement, and will remain stationary when not hunting prey. When anything moves nearby it, it will reach out towards it and attempt to grab it, retreating underground with its prey should it catch anything. The faint sound of rustling leaves can be heard as it moves.

= Strategy =

Avoiding
Slugcat can sneak past kelp by moving slowly, whether on land or water. If the player only taps the move button a bit at a time, the kelp will never reach towards them, and slugcat can make it safely past even the center. In water, the kelp will sense the player if the water is disturbed by waves or a waterfall, even if the player holds perfectly still.

Combat
The player can also get past a kelp by hitting it with a spear. After the kelp is stabbed, it will flail about for several seconds, unable to grab anything and harmless to slugcat. The player must be quick, however, as it will eventually regain its senses.

If a Kelp is hit with a spear multiple times, it will retreat underground and not appear again for many cycles, apparently having died. This can be done with a single spear, since the kelp will not grab anything for a short time after being hit, and the spear can be grabbed from its flailing body.

= Tips and Trivia =
 * Harmful explosives will cause Kelp to retreat underground in one shot.
 * While Kelp are only found in regions with lots of water, they can be located on land, and sometimes even on ceilings.
 * If a pole plant dies, there is small chance that a monster kelp will take its place a few cycles later. This can cause them to spawn in regions they are not usually found.
 * If the Slugcat is carrying a Glowstone, there is a chance a Kelp will drag it under the ground to eat, instead of the Slugcat.
 * Kelp will follow centipedes near it, but cannot grab and eat them. It is unknown if this a bug or not.
 * Developer commentary on the design of this creature and Daddy Long Legs can be found here.