Potion of Greater Invisibility? | EN World Tabletop RPG News & Reviews

Is there a way to make a Potion of Greater Invisibility by the RAW?

Reason I asked is that I goofed when DMing a 3.5 session a couple of weeks ago and didn't realize/remember that the Potions of Invisibility the characters were using would have expired when they made their first attack.

I see in the SRD that potions can normally only be made from 3rd level or lower spells. Are there any exceptions or ways around this?

I don't want to undo that section of the adventure or replay that section, but I need a good explanation for why other Potions of Invisibility won't work in like these did in the future.

Ideas?

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