The Giant Poisonous Chicken Nugget

The Giant Poisonous Chicken Nugget (abbreviated as the GPCN) was the first thing created by a Cosmic Zaaaaaaaap in $$-10^{289}$$ OYC.

What TGPCN is Made Out Of
TGPCN isn't actually made out of chicken, as chickens are extremely obscure, present only on a small planet in an unknown Universe.* In actuality, TGPCN is made out of a deadly poison and a strange, fleshy substance which has been reported to be extremely rubbery and squishy.

* They exist in a transfinite amount of planets and verses because there are so many that the same species managed to evolve.

Dangers
The GPCN, like its name suggests, is very poisonous. Consuming just 3 micrograms of TGPCN can kill a Multiversal-level entity in just over 16 seconds. Touching TGPCN will kill such an entity in about 94 seconds. A normal, non-god creature would get killed in only a few picoseconds by touching TGPCN.

Gods which are Omniverse-level or higher generally are not affected by TGPCN, and can touch and consume it without being harmed. Still, the poisonous nugget is very dangerous to all entities which are below Omniverse-level.

The poison which is infused into TGPCN appears to be a mix of Toxicium and hundreds, possibly even thousands, of other obscure elements, including a tiny bit of Glitchonicite. The reason to why the poison is so deadly is still unknown, and the substance is being studied in many locations throughout the Omniverse and beyond.

Eventual Destruction
The Giant Poisonous Chicken Nugget met its end in $$10^{194}$$ OYC, when many powerful gods beyond even the Cetaverse decided to destroy TGPCN for good. They ate the entire GPCN whole. Even though TGPCN is relatively harmless towards very powerful entities, eating the entire GPCN can still harm such an entity. Due to this, the entity which consumed TGPCN got relatively sick afterwards and was weakened. They later regained their strength.