The Moons Effects - Legodamen/The-John-Mod-Reborn GitHub Wiki

On the full moon The Johns and The Baby Johns have a 50 percent chance to spawn with a strength or speed buff. However, because the first night is always a full moon. For overall player experience reasons, this will happen on the second full moon, 7 days after the first night. However, The Hunted and The Mega John is both effected by Moon as well.