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.
Bite. Melee Weapon Attack. d20+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.
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.
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.
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 and even by crashing into the ground randomly. The creature has four large tentacles that may serve as multipurpose appendages.
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