Full disclosure - the following is a silly question.

The Grease spell states:

Slick grease covers the ground in a 10-foot square centered on a point within range and turns it into difficult terrain for the duration. When the grease appears, each creature standing in its area must succeed on a Dexterity saving throw or fall prone. A creature that enters the area or ends its turn there must also succeed on a Dexterity saving throw or fall prone.

There is already a precedent to making an item replicate the Grease spell, namely the Oil of Slipperiness:

Alternatively, the oil can be poured on the ground as an action, where it covers a 10-foot square, duplicating the effect of the grease spell in that area for 8 hours.

An Alchemy Jug is capable of producing up to 2 gallons of mayonnaise per day. I'm wondering how many gallons of mayonnaise (and thus how many Alchemy Jugs) would be required in order to replicate the effect of the Grease spell, if it can be done at all.

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    \$\begingroup\$ Why do you think any amount of mayonnaise will replicate a magic spell? Ultimately, this is just asking for how to homebrew a mayonnaise-based effect. \$\endgroup\$ – NautArch Jun 3 '19 at 18:13
  • \$\begingroup\$ I don’t know, I just thought about it, based on the fact that the Oil of slipperiness can reproduce the effect and is uhh, oily... \$\endgroup\$ – Gael L Jun 3 '19 at 18:15
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    \$\begingroup\$ Related on Why is Mayo in the alchemy jug? \$\endgroup\$ – NautArch Jun 3 '19 at 18:32
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    \$\begingroup\$ @GaelL I disagree, this is a valid question, albeit silly. There is also precedent for creating potions with non-magical effects with the Herbalism Kit which you may also want to add. \$\endgroup\$ – Akixkisu Jun 3 '19 at 18:34
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    \$\begingroup\$ Dang players and their ideas... \$\endgroup\$ – Slagmoth Jun 3 '19 at 18:43

Up to your DM*

*(they mayo may not allow it)

Shockingly, the spell does not say what kind of condiment-based equivalency would be needed to achieve the same effect (or even if it even could). Thus, this kind of situation would be entirely up to your DM.

It is worth noting that there would be almost no way of even adjudicating this based on real-world knowledge. The spell effect is not related to the amount of oil on the ground, it is a spell effect. And even if it was related, there's no way to know how much mayo could possibly even try to replicate the effect.

In the end, it is unlikely to matter in any case except in the situation that this becomes a commonplace occurrence such that it is outcompeting actually casting the spell (or a related ability). In which case, being that it is negatively affecting the fun at the table, the DM should adjust accordingly.

As someone who has dealt with (as a DM) and caused (as a player) wacky mayo-based hijinks (mayo-hem?), the best method is just to go with whatever sounds fun at the time and keep it consistent unless a problem crops up.1

1 - Tip: If you don't want material-based shenanigans, don't give your player an alchemy jug. It is the first thing every player I have given one to has done with it and really the only way to make it applicable to most campaigns.

  • \$\begingroup\$ Comments are not for extended discussion; this conversation has been moved to chat. \$\endgroup\$ – Rubiksmoose Jun 13 '19 at 13:53

Since no answer so far does the math: If we assume that 1 mm of mayo covering on a floor is enough to make it slippery (this number is just a very, very rough guess. I have never slipped on mayo), you need 10 foot * 10 foot * 1 mm = 2.454 gallons of mayonnaise.

In other words, the issue is not the volume, but how to spread it out. Mayonnaise is very viscous, and will not naturally flow into a sheet that thin. So my equally humorous answer is:

You need say three jugs, a breadknife and about half an hour of spreading the stuff about. Have fun.

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    \$\begingroup\$ Welcome to RPG.SE! Take the tour if you haven't already, and check out the help center for more guidance. Can you support your answer's inherent claim that this will replicate the Grease spell by citing evidence or experience? \$\endgroup\$ – V2Blast Jun 13 '19 at 8:34

It doesn't work like that.

First, "Mayo" doesn't show up in the equipment list at all, let alone as something that you could use gallons of to replicate spells, and there's no particular reason to believe that slathering the ground with mayo would have the same effect that a grease spell would. You're not generally going to be able to use nonmagical substances to duplicate a 1st-level spell. You can make mayo with the jug, certainly, but there's no indication that it's useful as anything other than a condiment.

To undermine this further, Oil of Slipperiness does exactly what you're asking for. It's an uncommon minor magical item. Mayo is not an uncommon minor magical item. It will not do the thing you want it to do.

If you're asking for homebrew rules to let you exploit your jug in new and interesting and mildly game-breaking ways, then this is not the place for them. If you're looking for ways to prepare terrain so that your enemies fall prone, however, you might consider ball bearings. If anything, as a DM, I'd be more inclined to rule that you might be able to duplicate those by slathering the ground with mayo. It would be a much more balanced way to unbalance the foe.

  • \$\begingroup\$ Comments are not for extended discussion; this conversation has been moved to chat. \$\endgroup\$ – Rubiksmoose Jun 13 '19 at 13:53

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