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Comment by trest

UPDATE: No longer does anything. You can either stash this away in your bank as a memento, or destroy it.
Original post kept for historical purposes:

Picked one up off a table (57.1, 47.6) in Tarren Mill during a Demon Invasion event (similar to taking a Potion of Fel Protection 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	Thunder Special	On tables inside the Inn, and outside on a table near the flightmaster. (53.7, 52.1)	10 minute stamina buff.
5	Battle-Mender's Dressing*	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.
†	Moongrass (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	Jar of Spiders	On one of the tables. (57.1, 47.6)	Targeted aoe damage.
1	Potion of Fel Protection*	On one of the tables. (56.9, 45.7)	10 minute damage reduction buff.
1	Blight Sample	Silver barrels in the old town hall in Southshore. (?)	Aoe damage and dot.
1	Ward of Sargeras	Horde crates at tower, southwest of Tarren Mill. (?)	Health regeneration and damage taken reduction buff.
1	Shadowstone	Horde crates at tower, southwest of Tarren Mill. (?)	Become invisible for a minute.
5	Felstone*	Horde crates at tower, southwest of Tarren Mill. (?)	Damage buff.
5	Battle-Mender's Dressing*	Horde crates at tower, southwest of Tarren Mill (?). On first aid creates at Allied training ground (44, 51 ?).	Bandage.
5	Molted Feather	Horde crates at tower, southwest of Tarren Mill. (?)	30 second movement speed buff.
Crossroads, Northern Barrens
1	Helbrim's Special	On table in front of Apothecary Helbrim. (48.6, 58.3)	10 minute damage buff. (+10% against demons)
†	Hearty Haunch	Inside inn on table in front of Larhka. (49.5, 57.6)	10 minute buff (“Hearty Meal!”). (+15% stamina; -5% armor)
Gadgetzan, Tanaris
^	Reinforced Armor	Talk to Krinkle Goodsteel. (51.1, 30.3)	5 minute buff — 5% reduced damage taken.
^	Gleaming Weaponry	Talk to Derotain Mudsipper. (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	Battle-Mender's Dressing*	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.)

Comment by Kaorhy

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

Comment by Gotnov

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

Comment by Treekachu

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

Comment by 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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Jar of Spiders

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Jar of Spiders

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