Object AC and Health

Given enough time and the right tools, characters can destroy any destructible object.

Damage Threshold(#). Big objects may have extra resilience called Damage Threshold.
The object can't take damage from a single Attack or Effect unless the attack's damage is greater than or equal to the object's Damage Threshold.

Substance	AC		Fragile	Resilient
Cloth, paper, rope	11	Tiny	2 (1d4) HP	5 (2d4) HP
Crystal, glass, ice	13	Small	3 (1d6) HP	10 (3d6) HP
Wood, bone	15	Medium	4 (1d8) HP	18 (4d8) HP
Stone	17	Large	5 (1d10) HP	27 (5d10) HP
Iron, steel	19	Huge	6 (1d12) HP	39 (6d12) HP
Mithral	21	Giant	7 (1d14) HP	52 (7d14) HP
Adamantine	23	Gargan.	8 (1d16) HP	68 (8d16) HP