The tsuchinoko is a legendary creature from Japan. It appears to be a snake with an arrow-shaped head, tapered tail, and wide body. It is not clear what it could be: a new species of snake, a pit viper that is digesting a meal, a skink, or some other creature.
Most of the times, the Tsuchinoko will not even show up, although occasionally it may be found burrowing underground. If the player can catch it while it still is above ground, they will have a short amount of time to kill it before it escapes. Its only attack is a poisonous spit.
Of all the non-boss monsters in the game, it has the fifth highest chance of giving over its soul (after Sky Fish, Kicker Skeleton, Flame Demon and Succubus), although this is still a low drop rate and can take several attempts before it finally yields it. Its soul grants the V.I.P. ability, which allows Soma to get discounts at Hammer's shop.