{hc} Booze!
It's been said that no one can outdrink a Fomoire and this is often true, but for somewhat different reasons than you might think.
Most fae are highly resistant to alcohol. It takes a lot to get them drunk, they prefer their own vintage, and mortal stuff is like water. Generally a miserable existence all around. For this reason, most fae booze hits like a semi truck made of bricks. Because fae can't get drunk otherwise! They need heavy, heavy intoxicants to reach that happy feeling and then they pound it until they pass out. Think Wolverine; just constantly fighting that superhuman healing factor to get wasted.
Where Fomoire differ is in the body's reaction to alcohol and other intoxicants. Fomoire bodies succumb at a delayed (by human standards) but still moderately logical rate for a bipedal mammalian creature. Obviously mortal stuff will take longer and the stronger fae stuff hits them much quicker, but they do actually get drunk like normal people. They love being drunk. How else do you really party? They feel very bad for those resistant to alcohol.
“But, Loren,” you say, “if Fomoire get drunk faster than sidhe, then why can no one outdrink a Fomoire?”
Well, I'm glad you asked. The reason is that Fomoire bodies find equilibrium VERY quickly (in all things, but specifically in this for now) and just kind of adapt and enter a holding pattern. All alcohols are slightly poisonous. It's why they make us feel all loopy and sick. So it comes back to the differences in how sidhe and Fomoire deal with damage. Sidhe take the hit and then heal it super fast to keep on going. Fomoire take the hit and don’t notice a hit happened (i.e. getting stabbed mid-fight and only noticing after everybody’s dead that they have a sword sticking out of them).
When sidhe drink, their bodies heal the damage done instantly, negating the effects of the booze. They're essentially fighting their own metabolism every time they drink (that depressing scene in First Avenger where Cap wants to be drunk, anybody?). Whereas Fomoire simply adapt. Their body recognizes a dangerous element, halt it, but don't have the ability to superheal to combat it. They basically quickly reach a form of homeostasis that renders the drinker happily smashed until they decide they're done now and it's sleepytime. Only then can the body begin to repair itself (at a much slower rate than the sidhe).
So, in a drinking contest between sidhe and Fomoire, the latter will be drunk as a fuck first, but they’ll also still be drinking two days later, sitting upright with their boots on the table singing shanties while the former cries under the table in their own vomit.
Hangovers are definitely still a thing for Fomoire, though. Hoo boy. Even Fomoiri bodies—tanks though they are—do not like being mildly poisoned. It's why many choose to just maintain a general drunken state to avoid the headache. Hence the stereotype of drunken sailors and rum-obsessed pirates.
In addition, it should be mentioned that the crafting of various alcohols is a highly-respected trade on Mag Mell. There are masters of the craft and they train their apprentices and pass on their secrets and compete with others in their community. Some specialize in one particular type of intoxicant (rum is the obvious favorite) while others branch out across several different boozes and drugs. A master brewer will receive just as much respect in the street as a master shipbuilder. Some even moreso. While not everyone owns a ship on Mag Mell, everyone drinks.
And for the record, Airn is a rum and citrus fan, Corv is a wino, and Diera likes bourbon.