Lynel

The Lynel is a centaur-like race found in many of the 2-D games in The Legend of Zelda series. They come in a blue and red variety and are extremely difficult to kill in close combat (Apparently their hide and armor is designed to withstand a lot of punishment from all forms of weaponry.) The Lynel has never been seen thus far in a 3-D Zelda game.

In Legend of Zelda, they are the most powerful enemies that roam the overworld, firing sword beams at Link in a similar fashion as he fires sword beams when he is at full health. Be aware, as their beams do two hearts of damage.

In A Link to the Past, they are quite powerful enemies too, roaming the Death Mountain area in the Dark World. They fire fireballs at you, and can be quite evasive. It is recommended to use Spin Attacks against these foes, as it's easier to hit them with this attack.

In Oracle of Seasons and Oracle of Ages they are given a slighty different design than LoZ, but have the exact same attack pattern and heart damage as their earlier counterparts.