Your first encounter with the Lizalfos in the Faron Grove.
Militaristic, cruel, and borderline feral, the Lizalfos and their ilk took over the Faron region around a couple years back. Most of their weaker warriors possess weapons that act as a missing link between a sword and a boomerang. The rest summon ghost swords out of thin air and use them in their attacks.
Lizalfos are the definition of a glass cannon. Just one of their attacks is enough to instantly kill someone, but they are very frail, and can be struck down quite quickly. The only exception to this rule is the Dynalfos, who are often found leading Lizalfos groups. Dynalfos spit streams of fire, and, unlike their lesser counterparts, can hold their own in melee.
Lizalfos have a streak of violence to them. Their favorite method of killing is carving off someone's face using their sword-like boomerangs. They then eat the fresh corpse raw, bones and everything. Gotta keep your jungle clean, am I right?