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You can't make Permanent Gush until HOLIII, coming next. The betatesters thought it unwise to make it available sooner. There are potions lying around however.
I found some Permanent Gush lying around in HOLII and it says "Permanently increases Endurance by +75" and same for Dexterity and Strength. When I take the potion though, it only increases each one by 1?
That's an engine problem. I have no control over that or the description.