pf2e.fyi
From Pathfinder #175: Broken Tusk Moon, which isn't enabled.

Burning Mammoth Longshield

CREATURE 1
UNCOMMONMEDIUMEVILHUMANHUMANOID
Perception +8
Languages Hallit
Skills Athletics +6 (+8 to Shove with Shield Raised), Intimidation +6, Survival +6
Str +3, Dex +1, Con +3, Int +0, Wis +1, Cha +1
Items Spear (3), Shield Boss, Wooden Shield, Hide Armor, Everburning Torch, Polished Topaz
AC 15 ((17 with shield raised)); Fort +10, Ref +4, Will +8
HP 20
Shield Block

Trigger The monster has its shield raised and takes damage from a physical attack.
Effect The monster snaps its shield into place to deflect a blow. The shield prevents the monster from taking an amount of damage up to the shield's Hardness. The monster and the shield each take any remaining damage, possibly breaking or destroying the shield.

Spurred by Death
Trigger An ally within 30 feet reduces a creature to 0 HP
Effect The longshield Steps or Strides.
Speed 20 feet
Melee Spear +9, Damage 1d6+3 piercing
Melee Shield Boss +9, Damage 1d6+3 bludgeoning
Melee Spear +7 (thrown 20), Damage 1d6+3 piercing
Opportunistic Defense
Trigger The longshield successfully Strikes with their shield boss
Effect The longshield Raises their Shield.
Shield Shove
Frequency once per round
Requirements The longshield's shield is raised
Effect The longshield rolls an Athletics check to Shove a creature in reach. If they roll a failure, they get a success instead, and if they roll a success, they get a critical success instead. The longshield's shield is lowered.
Pathfinder #175: Broken Tusk MoonOGL