The 2018 April Fools' event consisted of in-game joke items, the ring of random and the ring of rares, and a spoof video. Mod Lee also hosted a cow mass that would reportedly drop a rare cow staff.
- Burthorpe lodestone
- Grand Exchange
- Falador square
- Lumbridge lodestone
- North of Lumbridge Crater
- Varrock square
A ring of rares had the ability to turn the player into a handful old holiday rares, while the ring of random turned the player into old random event NPCs.
A rare cow staff item was reportedly a possible drop from cows during the event. At 13:59 UTC, the following in-game message was shown:
Join Mod Lee right now for a cow mass at http://twitch.tv/Runescape now, join in for a chance at the elusive Cow staff! Meet at the Lumbridge lodestone on w37. FC: Mod Lee
Mod Lee stated the item had a very low drop rate, which would change to a drop rate of roughly 1/200 during the livestream on 1 April 2018. He later stated during the stream that the item, along with the yak staff, is non-existent.
A rare yak staff item was reportedly a possible drop from yaks during the event. It was said to be more rare than the cow staff.  Like the cow staff, Mod Lee reported that it was fake.
- ^ Mod Lee. At 18:00 Game Time, I’ll be hosting a Cow Mass in World 37! We will be hunting for a new rare item (there’s actually two, I’ll tell you more on stream about it) that is dropped specifically from Cows! Join me in the ‘Mod Lee’ fc and watch live at:. twitter. 2018-04-01.*
- ^ Mod Lee. It’s developed and technically in the game now. However the drop rate is 1/5m atm. It will be changed on Saturday at reset to an actual achievable drop rate and during my stream the rate will be roughly 1/200.. twitter. 2018-03-26.*
- ^ Mod Lee. Yak staff April Fools by Mod Lee. twitch. 2018-04-01.*