Catapults are Objects.

Catapults are turret-like objects that appear to hurl poison, fire, lightning, and cold bombs high into the sky. They do not actually do so; these type of attacks fall from the sky in the four surface areas of Act Five, but are not directly connected to the catapults; the cold or fire projectile you see a catapult throwing will not actually fall somewhere, a few seconds later, and killing all of the catapults in a level will not end the continuing bombardment.

Catapults are worth experience and can drop items, but they can not be leeched from or chilled. They do not regenerate hit points.

All values are listed by difficulty level: Normal / Nightmare / Hell.

Statistics

Catapults drop items at the level of chests or barrels on the same level. Only a single item will ever be found from a catapult.

Type	Level	Experience	Hit Points	Speed 1	Max TC/Rune
Catapult	34 / 60 / 80	1123 / 23928 / 88800	317-629 / 4032-4704 / 12615-19624	--	Chest

Offense

Damage from catapult projectiles varies wildly between the damage types, so much so that it seems likely the designers simply didn't finish inputting the stats. Cold bombs don't actually do any damage at all; simply chill the target for an instant.

Fire bombs from Catapults do damage on impact, and scatter Fire Traps that erupt into a ground flame after a few seconds, damaging anything in the area.

Type	Poison	Fire	Ground Fire	Lightning	Cold
Catapult	'Norm: 65-105 over 10.3s (6.3-10.2/sec) Night: 89-129 over 10.3s (8.6-12.6/sec) Hell': 121-161 over 10.3s (11.7-15.6/sec)	10-21 13-24 17-28	'Norm: 32-150/sec Night: 60-206/sec Hell': 98-281/sec	3-8 / 3-8 / 3-8	0 / 0 / 0

Defenses

Catapults can not be leeched from or chilled/frozen. They do not regenerate hit points.

Regen Rate tells what % of a monster's hit points are recovered per second. Standard is 1.2/sec.
Blocking tells what % of successful, blockable attacks will not damage the monster. Monsters need not carry a shield to block.
Drain Effectiveness tells what % of a character's mana and life steal apply to that monster. 100 is all, 0 is none.
Chill Effectiveness tells what % of a character's cold length applies to the monster. 100 is all, 0 is no freeze/chill at all.

Type	Defense	Blocking	Regen Rate	Drain Effectiveness	Chill Effectiveness
Catapult	38 / 285 / 547	0%	None	0 / 0 / 0	0 / 0 / 0

Resistances

Resistances over 99% are listed as immunities and monsters will take no damage from that type of attack.
Immunities can be "broken" by skills that lower resistance, if the value drops below 99%. See the Resistances page for more details.

Type	Physical	Magic	Fire	Cold	Lightning	Poison
Catapult	0% / 0% / 33%	0% / 0% / 0%	0% / 0% / 0%	0% / 0% / 0%	0% / 0% / 0%	0% / 0% / 1000%

Locations

Catapults are found in the same locations in all difficulty levels and patch versions.

Type	Normal/NM/Hell
Catapult	Bloody Foothills, Frigid Highlands, Arreat Plateau, Frozen Tundra