Encasement: Calamity

is a deadly Senjutsu created by the slug and human duo; Iyasu and Senkai respectively.

Usage
As both species differ, their usage varies, but is also similar in a variety of ways.

Iyasu
Iyasu transfers natural energy blended with his own chakra to the ground, covering a wide radius with him as the epicentre. The area surrounded by the energy becomes the root for disaster. First and foremost, the entire spheric-covered range explodes, destroying the entire area, followed by massive whirlwinds, earthquakes and thunderstorms from the sky, if the latter is cloudy. Destruction will not cease unless the user chooses to stop it or runs out of chakra. Those clad in slug sage mode are apparently immune to such a devastating attack.

Senkai
Whilst in Sage Mode, Senkai exerts chakra into his surroundings for up to 10metres. Acting as the epicentre, he begins with non-stop explosions along with massive hurricanes comming from all directions into one focused point, crushing the target's bones. Thunderstorms are also launched from the sky if it is cloudy. However, unlike Iyasu's, Senkai focuses it on a particular point rather than the entire area, thus increasing its power tenfold.