Piercer (CR 1/2)

Tiny Vermin
Alignment: Always neutral
Initiative: -3 (Dex); Senses: darkvision 60 ft., Listen +13, and Spot +3


AC: 16 (+2 size, -3 Dex, +7 natural); 9 underbelly (+2 size, -3 Dex), touch 9, flat-footed 12
Hit Dice: 1d8 (4 hp)
Fort +2, Ref -3, Will +0
Speed: 5 ft., climb 5 ft.
Space: 2 1/2 ft./0 ft.
Base Attack +0; Grapple -13
Attack: Pierce +2 melee
Full Attack: Pierce +2 melee
Damage: Pierce 1d6
Special Attacks/Actions: Improved critical, acid
Abilities: Str 10, Dex 4, Con 11, Int 2, Wis 11, Cha 9
Special Qualities: Vermin
Feats: -
Skills: Hide +4*, Listen +13, and Spot +3
Advancement: 2 HD (Small); 3 HD (Medium-size)
Climate/Terrain: Any underground
Organization: Cluster (5-10) or colony (11-20)
Treasure: None

Source: Converted

The piercer appears as a normal stalactite (1 to 6 ft. long) found on cavern roofs. This is its outer shell. Inside, it appears as a slug with a long tail. A piercer can be identified by the two tiny eyestalks that curl along the side of it.