Feedlesquid

The Feedlesquid is a squid-like monster that first appeared in Chapter 8. According to Animos, it first tests its preys' strength. If it realizes that its preys are strong, it'll leave. Otherwise, it'll continue to disrupt its preys, kill them, and eventually eat them.

Battle Strategy
Feedlesquids are gigantic creatures, and according to Animos, no one in Wyvern Island has shown the capability of killing one except David, the strongest warrior in the entire island. They have multiple arms and tentacles that they usually use to test their prey's strength and vitality. They have also shown great intelligence, inquiring from their conditional behavior.

Simply slicing each of its shown tentacles is enough to prove that you're a strong prey, making it leave you unharmed. Failing to do so will think that you're a weak prey, thus making it kill and eat you. Feedlesquids are passive creatures if they're not hungry, but violent in a clever way if otherwise.