After cleaning the battle-field Sam and Chatur started moving to the cave. The previous night, Sam has made some critical modifications to the cave walls and now it has become a cave of one-way access.
Once someone stepped in they cannot go out. At least someone in this layer.
He also enchanted the inscribed formation and a spiritual imprint to get a message when someone stepped in. He could also feel someone else trying to destroy the formation and the seal.
Sam didn't care though. He is not worried someone would destroy it before he came.
After a short while, they are already near the cave. He saw a merman and a Naga trying their best to destroy the barrier of the cave. But as they are damaging the barrier bit by bit, the barrier is reflecting the attacks back at them and they are trying their best to dodge.
It is the same case inside the cave. No matter what the Yaksha inside is trying to do, every attack is being reflected back at him.