Sand Sentry

Creature 6

Medium
earth
elemental

Perception: +14; darkvision, tremorsense (imprecise) 60 feet
Languages: Petran
Skills: Acrobatics +14, Stealth +14; Str +5, Dex +2, Con +4, Int +0, Wis +2, Cha +1

AC: 24; Fort +16, Ref +12, Will +14
HP: 90; Immunities bleed, paralyzed, poison, sleep

Glass Armor When the sand sentry takes electricity or fire damage, its outer layer of sand fuses into sheets of hardened glass for 1 minute. This increases the sand sentry's AC to 26 and grants it resistance 5 to acid, cold, electricity, fire, force, piercing, and slashing damage. A sand sentry can't use earth glide while glass armor is active.

Speed: 25 feet, burrow 50 feet, earth glide

Melee ◆ fist +17 (unarmed), Damage 2d8+8 bludgeoning plus Blinding Sand

Blinding Sand When the sand sentry critically hits with a fist Strike, the target is Blinded for 1 round.

Earth Glide A sand sentry can Burrow through earthen matter, including rock. When it does so, it moves at its full burrow Speed, leaving no tunnels or signs of its passing.

Source: Pathfinder Monster Core 2

Running this fight? Add the sand sentry to the initiative tracker: type its name and the AC, hit points and Perception for initiative fill in, and the book button shows this stat block mid-fight.