Picked one up off a table (57.1, 47.6) in Tarren Mill during a Demon Invasion event (similar to taking a Зелье защиты Скверны off one of the other tables there).

Gives a ground targeting circle when activated/cast which you then click where you want to throw the jar to. Does aoe damage. Not sure yet what happens with the spiders as the one time I tried it I was killed by the boss we were fighting.

Lootable consumables and buffs during demon invasions:

(@perculia has made an official Wowhead post incorporating this information and more stuff I missed.)

In addition to the 3 consumables purchasable from the invasion vendors, there are various consumables that can be looted in the invasion starting towns.

~~When you are at the carrying limit (max) for one of these items, trying to loot another will send it to your mailbox.~~ The mailbox trick no longer seems to work.

Max	Item	Location	Effect
Orgrimmar Rear Gates, Azshara
Kharanos, Dun Morogh
1	Громоварское особое	On tables inside the Inn, and outside on a table near the flightmaster. (53.7, 52.1)	10 minute stamina buff.
5	Одеяние боевого лекаря*	On the medical crates beside the road in Kharanos. (53.4, 51.9)	Bandage.
†	Powder Keg	Near the entrance to northeast building. (53.2, 50)	Short duration targetable aoe damage.
†	Лунная трава (and other herbs)	On the fel-scorched ground near fel invasion building. (67.4, 57.4)	10 minute buff to Haste (25%) and reduction of maximum health (-10%). (other herbs may have different effects)
Tarren Mill, Hillsbrad
1	Банка с пауками	On one of the tables. (57.1, 47.6)	Targeted aoe damage.
1	Зелье защиты Скверны*	On one of the tables. (56.9, 45.7)	10 minute damage reduction buff.
1	Образец гнили	Silver barrels in the old town hall in Southshore. (?)	Aoe damage and dot.
1	Оберег Саргераса	Horde crates at tower, southwest of Tarren Mill. (?)	Health regeneration and damage taken reduction buff.
1	Камень Тьмы	Horde crates at tower, southwest of Tarren Mill. (?)	Become invisible for a minute.
5	Камень Скверны*	Horde crates at tower, southwest of Tarren Mill. (?)	Damage buff.
5	Одеяние боевого лекаря*	Horde crates at tower, southwest of Tarren Mill (?). On first aid creates at Allied training ground (44, 51 ?).	Bandage.
5	Линялое перо	Horde crates at tower, southwest of Tarren Mill. (?)	30 second movement speed buff.
Crossroads, Northern Barrens
1	Особый рецепт Хелбрима	On table in front of Аптекарь Хелбрим. (48.6, 58.3)	10 minute damage buff. (+10% against demons)
†	Hearty Haunch	Inside inn on table in front of Ларка. (49.5, 57.6)	10 minute buff (“Hearty Meal!”). (+15% stamina; -5% armor)
Gadgetzan, Tanaris
^	Усиленная броня	Talk to Кринкель Сталлер. (51.1, 30.3)	5 minute buff — 5% reduced damage taken.
^	Сияющее оружие	Talk to Деротайн Грязеглот. (51.1, 30.3)	5 minute buff — 5% increased physical damage dealt.
†	bomb?	At the docks, south of Gadgetzan. (?)	Damage and stun.
Sentinel Hill, Westfall
5	Одеяние боевого лекаря*	On the table at the medic camp near the northern perimeter of the town. (56.9, 42.6)	Bandage.
†	Powder Keg	Inside Sentinel Tower (53.2, 50), and the lumber mill (54, 53.5)	Short duration targetable aoe damage.

* Also sold by the invasion vendors.
† Gives effect, not looted item.
^ Talk to NPC for buff.

(Thanks to @Feliciamarie, @Gerbert, @Friarruse, @dumenc, and @Vahl, for contributions.)

Комментарий от Kaorhy

Off GCD.
Seems that this item is the only combat related consumable from pre patch that doesn't have a limited duration.

Комментарий от Gotnov

These are currently usable in battlegrounds... i got hit with one in teh 20-29 bracket and it instakilled me :(

Комментарий от Treekachu

This item was available to players only during the Legion prepatch. It is no longer obtainable in game.

Комментарий от Kaorhy

No longer usable as of 8.0. Items collectors can still keep it for the memories; it's still green quality, a fairly rare situation for items that no longer have any uses.

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