Tsuchinoko

The Tsuchinoko is a rare snake that is found in Castlevania: Aria of Sorrow. It has 200 hp and is weak to darkness attacks.

Castlevania: Aria of Sorrow
"A mythical snake proven to exist by Soma Cruz in 2035."

Location
The Tsuchinoko is found in the area after the Golem boss.

Strategy
Most of the time it doesn't even show up, but occasionally it is found burying underground. If Soma can catch it when it is above ground, he has a small amount of time to kill it before it buries underground. Its one attack is poisonous spit. It has a relatively low chance of giving over its soul, so around 20-30 tries should be enough.