Freedom of Movement. The yama tsukami ignores difficult terrain, and magical effects can't reduce its speed or cause it to be Restrained. It can spend 5 feet of Movement to escape from nonmagical restraints or being Grappled.
Siege Monster. The yama tsukami deals double damage to Objects and structures.
Multiattack. The yama tsukami makes three tentacle attacks, each of which it can replace with one use of fling.
Tentacle. Melee Weapon Attack. +14 to hit, reach 20ft., one target. Hit: 18 (3d6 + 8) bludgeoning damage, and the target is Grappled (escape DC 18). Until this grapple ends, the target is Restrained. The yama tsukami has six tentacles, each of which can grapple one target.
Fling. One Large or smaller object held or creature Grappled by the yama tsukami is Thrown up to 60 feet in a random direction and knocked prone. If a Thrown target strikes a solid surface, the target takes 3 (1d6) bludgeoning damage for every 10 feet it was Thrown. If the target is Thrown at another creature, that creature must succeed on a DC 18 Dexterity saving throw or take the same damage and be knocked prone.
Bite. Melee Weapon Attack. +14 to hit, reach 5 ft., one target. Hit: 21 (3d8 + 8) piercing damage. If the target is a Large or smaller creature Grappled by the yama tsukami, that creature is swallowed, and the grapple ends. While swallowed, the creature is Blinded and Restrained, it has total cover against attacks and other effects outside the yama tsukami, and it takes 42 (12d6) acid damage at the start of each of the yama tsukami's turns. If the yama tsukami takes 40 damage or more on a single turn from a creature inside it, the yama tsukami must succeed on a DC 20 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the yama tsukami. If the yama tsukami dies, a swallowed creature is no longer Restrained by it and can escape from the corpse using 15 feet of Movement, exiting prone.
Summon Great Thunderbugs (Recharge 6). The yama tsukami releases 5 (1d10) great thunderbugs from its mouth that occupy a space within 20 feet of the yama tsukami.
When a great thunderbug summoned by the yama tsukami dies, it explodes in a burst of lightning. Each creature within 10 feet of it must make a DC 13 Dexterity saving throw, taking 7 (2d6) lightning damage on a failed save, or half as much damage on a successful one.
Fire Plume (Recharge 5-6). The yama tsukami releases a plume of fire from its underside in a 30-foot radius around it. Each creature in that area must make a DC 20 Dexterity saving throw, taking 28 (8d6) fire damage on a failed save or half as much on a successful one.
The yama tsukami can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The yama tsukami regains spent legendary actions at the start of its turn.
Summon Great Thunderbugs or Fire Plume. The yama tsukami uses its Summon Great Thunderbugs or Fire Plume.
Tentacle Attack or Fling. The yama tsukami makes a tentacle Attack or uses its Fling.
Whirlwind (Costs 2 Actions). The yama tsukami extends out all of its tentacles and spins in circles. Each creature within a 20 foot radius of the yama tsukami must succeed on a DC 18 Dexterity saving throw, taking 22 (4d10) bludgeoning damage and are knocked prone on a failed save.
Description
Yama Tsukami is an unusual Elder Dragon with an octopus-like body. It is covered in moss, algae, and other plant life, and boasts a set of four thick tentacles. In addition, it possesses two large whiskers and an oddly human-like set of teeth and gums. It produces gas within its body in order to keep itself afloat.
Yama Tsukami are constantly traveling through different areas in order to find suitable fertile land for them to feed on, even traveling over vast seas. Yama Tsukami is a dangerous monster that can potentially swallow a whole village or town. However it is believed that the winds in environments can send Yama Tsukami unintentionally into some areas so it might not intentionally be heading to attack towns. Though, most heavily forested areas are most at risk of getting eaten by a Yama Tsukami. Strangely around parts of a Great Forest, Yama Tsukami of different colors and sizes have been seen. It's theorized that they are either adults and juveniles, subspecies, or just environmental conditions. Most believe that it is due to environmental conditions that there are many different Yama Tsukami.
Yama Tsukami's most notable adoption is its ability to float with no obvious method of propulsion. From the large amounts of dirt and rotting flesh that a Yama Tsukami has swallowed, it all produces a gas inside its body that allows it to float in the air without wings. It is able to control the amount of gas it uses and able to use it as a rudder as it floats in the air.
It can even use the gas as a weapon and as a defensive shield. Despite being able to control it, Yama Tsukami can be knocked out of the air if enough damage is done to it and even by crashing into the ground randomly. The creature has four large tentacles that may serve as multipurpose appendages. These tentacles are light yet very slimy It could use these to snare prey, uproot plants, or anchor itself to landmasses or trees. At the end of these tentacles, there seem to be claws. It also uses them like whips when defending itself, crushing anything that tries to challenge it. Yama Tsukami also has a pair of large whiskers, which it uses as tentacles as well. Yama Tsukami has the parasitic Dragonwood and the mysterious Dragonmoss growing from its back along with trees and many different plants. The exact cause of this is its feeding on forest and on lakes along with its blood which is the nutrients for many different species of plants. Due to this, Yama Tsukami have become a "special" environment for some living things such as the Great Thunderbug. Sometimes as it eats whole forests and lakes, Yama Tsukami will also suck up or eat Great Thunderbugs that are caught in its mouth. From the Yama Tsukami being a "special" environment for them, they become quite different from the normal Great Thunderbugs and develop differently compared to them. They even seem to develop a bond with Yama Tsukami and will defend it from any potential threats. Yama Tsukami have incredibly long lifespans numbering in the thousands of years.
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