Beholder
One glance at a beholder is enough to assess its foul and otherworldly nature. A beholders spheroid body is covered in chitinous plates, scales, or leathery flesh. Its great bulging eye sits above a wide, toothy maw, while the smaller eyestalks that crown its body twist and turn to keep its foes in sight. A beholder channels extraordinary levels of magical power. Its central eye emits a broad field of energy that can nullify the magic of its foes, while its eye stalks blast those foes with a host of powerful effects.