Moons

The moons in the Kingdom of Loathing, Ronald and Grimace, affect several things. There are certain days, called Stat Days, on which stat gains are 50% higher for one particular stat. If Ronald is full, MP gains are doubled. If Grimace is full, HP gains are doubled. The moons also affect Temporary Lycanthropy (obtained from blood of the Wereseal), the Grue familiar, and the effects of the Talisman of Baio and the Jekyllin hide belt.

For a rundown of upcoming moons see this moon page or this other moon page. You can also enter chat and give a private message consisting of "day" to Chatbot (/msg chatbot day) to be told how many days until the moons have an effect on a stat.

Here's how it all pans out:

Ronald	Grimace	Stat Day	Resting	Temporary Lycanthropy	Grue	Talisman of Baio	Jekyllin hide belt
		Moxie		-100% Muscle	Attacks	No Effect	+9 All Stats +15% Item Drops
				-75% Muscle	Attacks	+10% All Stats	+8 All Stats +20% Item Drops
				-25% Muscle	Attacks	+30% All Stats	+6 All Stats +30% Item Drops
				No Effect	Attacks	+40% All Stats	+5 All Stats +35% Item Drops
		Mysticality	x2 MP	+50% Muscle	Does Not Attack	+60% All Stats	+3 All Stats +45% Item Drops
				+25% Muscle	Does Not Attack	+50% All Stats	+4 All Stats +40% Item Drops
				+25% Muscle	Does Not Attack	+50% All Stats	+4 All Stats +40% Item Drops
				No Effect	Attacks	+40% All Stats	+5 All Stats +35% Item Drops
		Muscle	x2 HP	No Effect	Attacks	+40% All Stats	+5 All Stats +35% Item Drops
		Muscle	x2 HP	+25% Muscle	Does Not Attack	+50% All Stats	+4 All Stats +40% Item Drops
				+25% Muscle	Does Not Attack	+50% All Stats	+4 All Stats +40% Item Drops
				+50% Muscle	Does Not Attack	+60% All Stats	+3 All Stats +45% Item Drops
		Mysticality	x2 MP	+50% Muscle	Does Not Attack	+60% All Stats	+3 All Stats +45% Item Drops
				+25% Muscle	Does Not Attack	+50% All Stats	+4 All Stats +40% Item Drops
				-25% Muscle	Attacks	+30% All Stats	+6 All Stats +30% Item Drops
		Moxie		-50% Muscle	Attacks	+20% All Stats	+7 All Stats +25% Item Drops

References

• The names of the moons, Ronald and Grimace, are the same as Ronald McDonald and the Grimace, two of the mascots of the McDonald's fast-food restaurant chain.

• As for the moons themselves, they are very reminiscent of Trammel and Felluca, the moons from the Ultima series of games by Richard Garriott.