Geonid

Small Elemental, Neutral

AC: 17

Initiative: +0 (10)

HP: 26 (4d6 + 12)

Speed: 30 ft.

STR
12 (+1)
DEX
10 (+0)
CON
16 (+3)
INT
9 (-1)
WIS
14 (+2)
CHA
11 (+0)

Skills: Perception +4, Stealth +2

Senses: darkvision 60 ft., tremorsense 30 ft., Passive Perception 14

CR: 1/4 (XP 50; PB +2)

Boulder Guise.

While fully withdrawn into its shell, the geonid can't see and is indistinguishable from a small boulder

Actions

Club.

Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 1) bludgeoning damage.

Stone Tell.

The geonid touches a stone object or surface and knows what types of creatures have been within 10 feet of that stone in the past 24 hours. The geonid can also determine the number of creatures of each type, but not their identities.

Find this creature in the encounter builder

Geonid

Source: The Tortle Package, p. 22 - Licenses and attribution