Tempest Serpent

Tempest Serpents (嵐蛇), are the strongest known monster, aside from Veldora and Rimuru, within the Sealed Cave.

Appearance
The snake has a large, jet-black body with thorned scales and tough skin.

Skills
A tempest snake has two known Intrinsic Skills:
 * Sense Heat Source: Identifies any heat reactions in the local area. Not affected by any concealing effects.
 * Poisonous Breath: A powerful breath-type poison (corrosion) attack. Affects an area seven meters in front of the user in a 120-degree radius.

Trivia

 * When encountering it for the first time, Rimuru calls it Black Snake (黒蛇) as a temporary name.