|Advanced Taverns & Tankards|
The character's Drink Threshold is equal to 1 + CON modifier (minimum 0). It shows how many servings of alcohol the character can drink within an hour before its effects start to kick in. One serving equals a mug of ale, or a glass of wine, or a shot of spirits. After reaching the threshold the character must make a Save vs Poison for every further drink, with no penalty for the first one, but a cumulative -2 for each drink after that.
After the first failure the character becomes tipsy, receiving a small penalty (-1 on d20 rolls, -5% on percentile rolls) for every action. After 1-2 hours of rest he becomes sober again.
After the second failure the character becomes slightly drunk, receiving a medium penalty (-2 on d20 rolls, -10% on percentile rolls) for every action. He is also braver and more tolerant to pain, resulting in +1 hit point for every hit dice. After 1-2 hours of rest he becomes tipsy again.
After the third failure the character becomes drunk. He is incapable to do anything effectively (-4 on d20 rolls, -20% on percentile rolls), but is always eager to prove the opposite. He is fearless and shrugs of pain easily, resulting in +2 hit points for every hit dice. After 1-2 hours of rest he becomes slighty drunk again.
After the fourth failure the character passes out, usually after saying good bye to his lunch. He is incapacitated and totally unaware of his surroundings. He will sleep for 4-8 hours before becoming sober again and he must make a System Shock roll to avoid losing one point of a random characteristic permanently.
If the character reaches at least the slighty drunk stage, he will have a hangover the next day. The length of the hangover depends on how drunk he was. For slightly drunk it lasts for an hour, for drunk it lasts for a day, for passed out it may last for 1-3 days. During hangover the character is fatigued and sick, acting as if he had lost half his levels. Druids and alchemists might know cures that can shorten the length of hangover. The Remove Disease spell cures hangover, while Remove Poison nullifies the effects of alcohol.
We'll see how they work out in practice. They seem a bit lenient, but this is for an age of hardy people and less refined alcoholic drinks. Cheers!
1 I have absolutely no clue if it was written from scratch, or was based on already existing rules. The levels do remind me of HackMaster 5e, but it's been a while since I've read those and my books weren't available when writing this post. If anyone finds any similarity to other drinking rules, please let me know.