Developed by demonic armies during the endless battles of the Blood War, abyssal jelly is a thick, black-red gel that clings to surfaces and burns with unnatural fury. The substance is typically stored in sealed glass or ceramic jars. While contained, the jelly remains inert. Once exposed to a spark, open flame, sudden impact, or similar source of ignition, it erupts into ravenous abyssal fire.
As an action, you can use a jar of abyssal jelly in one of the following ways:
Throw. You hurl the jar at a point on the ground you can see within 20 feet of you. The jar shatters on impact.
Spread. You pour the jelly onto the ground, coating a 5-foot-square area.
When the jar shatters or the jelly is otherwise ignited, it explodes in a violent burst of abyssal flame. Each creature and flammable object in the affected area takes 31 (8d6) fire damage and catches fire.
The area then burns for 1 minute with roiling black flames. These flames can't be extinguished by water, smothering, mundane means, or magic. The only recorded method Abyssal Jelly being successfully extinguished was with the control flames spell.
A creature that enters the burning area for the first time on a turn or starts its turn there takes 21 (6d6) fire damage and catches fire. Anything ignited by the jelly takes 10 (3d6) fire damage at the start of each of its turns. A creature or area burning with abyssal fire remains aflame until the fire burns out.
The flames created by abyssal jelly are known as Hellfire. Damage dealt by abyssal fire ignores resistance and immunity to fire damage. In addition, a creature vulnerable to fire damage takes triple damage from abyssal fire instead of double damage. Hellfire has even been recorded melting through stone and metal alike, as well as turning sand to glass.
Blood War Legacy. Legends claim that abyssal jelly was first devised by demon generals seeking a weapon capable of burning through celestial fortifications and infernal war machines alike. Though crude by modern standards, caches of the substance still surface across battlefields, forgotten strongholds, and ancient planar ruins where the Blood War once raged.
Notes: Damage: Fire, Damage: Fire, Damage: Fire, Damage, Combat, Consumable
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