Players can offer bird's eggs to the shrine to receive 100 Prayer experience and a bird nest, containing tree seeds and fruit tree seeds. In addition, there is a 1/300 chance of receiving a piece of the evil chicken outfit. Any outfit piece will replace a nest, so a full inventory will not compromise receiving the outfit piece.
According to Nesty, it is the shrine to the "almighty one". Since players can receive pieces of the evil chicken outfit, it can be assumed the shrine was made for the Evil Chicken.
Rewards
Each piece of the evil chicken outfit has a 1/1200 chance of being awarded, resulting in a 1/300 chance of receiving any outfit piece.[1] There is no duplicate protection for pieces of the outfit.
[[{{#explode:2 September 2021| |0}} {{#explode:2 September 2021| |1}}]] [[{{#explode:2 September 2021| |2}}]] (update)
The egg shrine now tells players how many god eggs they have offered to it upon offering one to it.
References
^Jagex. Mod Ash's Twitter account. 11 May 2020. Archived from the original on 24 August 2020. Mod Ash: "The head is 1/1200. The wings are 1/1200. The legs are 1/1200. The feet are 1/1200. Thus the chance of getting an outfit piece is 1/300."