That would give it a CR of 1/2, but I wouldn't worry about it - a first level party should still win against three or four of these, as their damage is quite light. I would change it in the following ways: it is resistant to slashing and piecing damage as well as bludgeoning, it has no natural armour but it's dexterity is 18 (this will give it a bigger bonus to initiative, increasing the chance it will get an attack before it dies), it has a movement speed of 40' - if you want to make the point that it is fast it should be faster than the PCs. Your creature is odd (for a slime) in FOUR ways - it has the wrong resistance, it has armour, it is fast and it can dissolve armour. It is described as a ten-foot cube of transparent gelatinous ooze. Now, you can set out to challenge expectations, particularly if your players are experienced, but in that case it is best to only have one thing that is odd about your creature. A gelatinous cube is a fictional monster from the Dungeons & Dragons fantasy role-playing. Mechanics aside, part of designing a good monster is that the players should be encouraged to suspend disbelief by the creature's stat block matching what they intuitively expect. If you intend to try and overwhelm the party with numbers, I would expect a typical party of four 1st level characters to kill at least two of these per round. Bludgeoning damage isn't particularly common in 5e, since wizards are more likely to use firebolt than hit it with a staff, so it's unlikely the party will even notice it's resistance. The standard grey ooze is fine for a 1st level party.Ī typical 1st level character has an attack bonus of +5, which means they will probably (55%) hit AC 14 on the first attempt, doing an average 7.5 points of damage (longsword), killing it outright. I would ether lower it's AC and increase it's HP, or decide that it is superfast and it's AC is due to dex bonus.Īnd don't take the DMG to literally, it's just a guideline, think about how your monster will perform in play (with only 7 hp, it will probably not last until the end of the 1st round, even with resistances), and how much XP you want to give your players for killing it.Īs it stands, I would say it is weaksauce but annoying. Although my DM did come up with a superfast 'gelatinous sphere' that had a high AC due to it's dex bonus. The idea of 14 natural armor seems a bit odd - most slimes are easy to hit. you regret letting the fighter have full plate at level 1) go ahead and buck the trend.

However, if you have a plot reason for wanting to destroy something (e.g. If you look at the design of slimes and oozes in 5e, you can see that they follow a trend, with the ability to damage weapons and armour being reserved for the most powerful.

Slime monster d&d