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I have a forum-based Pathfinder campaign where one of the players would like to light grease created by a Grease spell on fire. Can this type of grease be lit?

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I've seen DM's go both ways with this. If you allow the player to light the grease on fire, couldn't you treat it as a wall of fire and remove the grease effects (no longer a slippery surface)? –  DanceSC Sep 4 at 14:37

3 Answers 3

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The rules as written don’t allow for the possibility, and there’s every reason to think that magically-created grease is not literally the same substance as mundane grease and therefore does not share the properties not listed in the grease spell description.

Moreover, grease is one of the best spells for its level in the game, which makes many DMs leery of opening up yet more features for it. On the other hand, DMs also like to reward creativity, so some do allow grease to be lit on fire. You will have to ask your DM for a more solid answer than “the rules don’t say you can, so you can’t.”

My first character ever, a sorcerer, had grease as something of a signature spell, and this was one of the first “tricks” I tried with it. The DM didn’t allow it, and considering how much use I got out of the spell despite lacking that option, I think he made the right call, and I’ve made the same call in all of my games since. I have never seen anyone complain that grease is unusable without that feature. Again, it’s one of the best spells out there.

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Also note that depending on the type, not all grease is super flammable. I always imagined the spell generating something like industrial grade lubricant grease. That does not burn so much as it creates tons of gross black smoke. Which could still be useful in game, and which I would still rule against for the same reasons as the flaming grease –  D.Spetz Aug 27 at 12:46
    
I am the DM, and I need help deciding if I should allow that. –  Randumbness Aug 27 at 20:02
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@Randumbness Well, I did try to give my reasoning for why I rule a particular way. Also, it may be worth considering the fact that 3.5 had a 2nd-level spell, incendiary slime, which "functions like grease, but the liquid is also highly flammable." So in 3.5, at least, grease does not produce a flammable liquid, and you need incendiary slime for that. Bumping it up a spell level makes adding that feature a good deal more reasonable, too. –  KRyan Aug 27 at 20:10

KRyan makes an excellent point- even without the ability to light the resultant substance on fire, the spell is by no means use impaired. On the other hand, actual grease certainly is flammable, and when a word used in rules text does not have a defined game-specific meaning, most people default to the normal meaning of the word. If the substance created by the spell were ruled not actually grease, but some other substance, I would probably start investigating what it actually was. Otherwise, I think you might have to pick between trying to balance things and enjoying the verisimilitude. If you care more about the latter, I'd allow the substance to be lit on fire like normal grease.

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If you happen to own the Thunderscape campaign setting, there's an item there called alchemical grease. It duplicates the effects of a grease spell and has rules for being set on fire. If you don't have it, I'm sure you can come up with something, if you want the spell to be flammable. –  gatherer818 Aug 27 at 8:05
    
@gatherer818 I'm using the Forgotten Realms setting, unfortunately. –  Randumbness Aug 27 at 20:03
    
I meant to use the rules from the grease in that setting as rules for setting the grease spell on fire, not to use that setting for your game. Kind of like I only bought Eberron for 3.5 for the Artificer class :D –  gatherer818 Aug 27 at 20:11

Yes. As written there is nothing preventing this first level spell from being lit just like grease from other sources.

Grease

However it would be logical to assume that lighting it in this manner would be similar to lighting any other flammable fluid, it consumes the flammable substance far quicker than the conjuration spell would provide normally. Give it a round or 2 to dissipate.

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