Goblin

"A small humanoid creature standing 3 feet tall, with yellow-orange skin."

The goblin is a beginner monster that's easy to kill. It has 9 AC and can be found on all levels of the dungeon. It has 10 strength, 11 dexterity, and about 17 HP. When it hits it does 1-6 damage. Goblins drop 15 XP when they die. Goblins, it would seem, also have a high chance to drop additional items like spells.