rare n small construct mindless 

Variant tattoo guardian (Bestiary 3 262)

Perception +27; darkvision

Skills Acrobatics +33

Str +6 Dex +9 Con +6 Int -5 Wis +5 Cha +2

AC  39; Fort +27, Ref +30, Will +35

HP 330; Immunities critical hits, death effects, disease, doomed, drained, fatigued, grabbed, healing, mental, necromancy, nonlethal attacks, paralyzed, poison, precision, prone, sickened, unconscious

Extra Reaction A thorn guardian gains an additional reaction each turn but can use this extra reaction only to Retaliate.

Attack of Opportunity [R]

Retaliate [R] Trigger A creature within the thorn guardian's reach attacks the guardian's ward; Effect The thorn guardian makes a briar Strike against the triggering creature. If it hits, it deals an additional 2d6 persistent bleed.

Speed fly 20 feet

Melee [>] briar +30, Damage 3d12+12

Bond with Ward [>] (concentrate, move) Requirements The thorn guardian is Bonded with its Ward; Effect The thorn guardian removes itself from the ward and enters an adjacent space.

Interpose [>] Requirements The thorn guardian is Bonded with or adjacent to its ward; Effect The thorn guardian interposes itself between the ward and its foes, granting its ward a +2 circumstance bonus to AC until the start of the thorn guardian's next turn.

Strength of Thousands #6: Shadows of the Ancients, page 19.