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From Pathfinder Rage of Elements, which isn't enabled.

Limestone Shield

ITEM 7
EARTHMAGICAL
Price 350 gp
Bulk 4
AC Bonus +2
Hardness 7
HP 28
BT 14
Speed Penalty −5 ft.

This tower shield is a slab of limestone, shaved to a portable size and weight. The shield has Hardness 7 and 28 Hit Points.

Activate—Limestone Wall (concentrate, manipulate)
Frequency once per day
Effect You set the shield down as it expands up to 60 feet wide and 10 feet tall. Each square of the wall has AC 10, Hardness 7, and 28 Hit Points, and it's immune to critical hits and precision damage. If a section is destroyed, this effect ends, and your limestone shield is broken. You can Dismiss this activation, which otherwise lasts for 1 minute.
Activate—Block Elements (concentrate)
Frequency once per day
Trigger You're targeted by an effect with the air, fire, or water trait
Effect The shield expands to block the triggering effect, granting you standard cover from that effect.
Pathfinder Rage of ElementsOGL