The Mysterious egg is a rare drop from the second elite dungeon, the Dragonkin Laboratory.
It can only be obtained while having lucky charms in the player's inventory. Having the Mysterious perk on the player's equipment allow the player to have a drastically increased drop chance for this item in the Dragonkin Laboratory.
Finding the egg with the Mysterious perk on the player's gear gives an additional chatbox message and popup message that says You feel something mysterious take effect.
Interacting with it causes the egg to disappear and the player unlocks the Mysterious Chicken companion pet.
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For an exhaustive list of all known sources for this item, see here
- ^ There is further information on this drop; see the associated page for details.
- ^ Jagex. Mod Orion's Twitter account. 24 June 2019. (Archived from the original on 3 July 2020.) Mod Orion: "Missed the Easter event? Still want to get the Mysterious Chicken? Dragonkin Laboratory might have a few eggs..."
- ^ Jagex. Mod Orion's Twitter account. 3 July 2020. (Archived from the original on 3 July 2020.) Mod Orion: "It's absolutely possible [to get the Mysterious Egg from the Dragonkin Laboratory]. It has been on the drop table since I said it was"
- ^ Jagex. Mod Orion's Twitter account. 3 July 2020. (Archived from the original on 3 July 2020.) Mod Orion: "There is something you can do to make the drop rate much, much better. I won't tell you what it is though."
- ^ RuneScape. mysterious perk :o. 21 July 2020. "Mod Orion: 'If you have the Mysterious perk on your equipment and you go into the dungeon, it's like 500x more common. So, enjoy your free pet.'" Significantly more likely to drop when the player has the Mysterious perk on one of their equipped items.