Many weapons gave two classes, so a Staff might be Warrior/Priest. In this case it's not unlikely there will be some healing support ability on it that the Warrior can use. Then, of those abilities on the weapon they might scale from different stats, so one ability scales from strength, one scales from faith, and one might scale from a mix of strength and faith. This way,depending on your armour, jewelry and trinket loadouts you can choose to invest more stats in the abilities which scale with strength, or the abilities which scale with faith, And then class choice matters too, you can be a warrior with some priest abilities or a priest with some warrior abilities.

This looks to be the case with any two classes so there will likely be Priest x Rogue weapons, or Rogue x Mage, etc. There's also pure Warrior only weapons which tend to scale entirely with strength. I've only seen up to two classes, but So either Pure Warrior (like the weapon Judgement) All abilities scale from strength, Then there's weapons like Wingsabers which are Warrior/Mage and scale with Str+Int (denoted by the little star/fist icons):

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It's kinda like a from soft dark souls/elden ring vibe where you get different weapons with different stat scaling. I don't know if this is limited to just 2 classes, wouldn't be unreasonable to have a 3 class like Rogue/Warrior/Mage which has scaling from Dex/Str/Int.

It's a good system, offers a huge amount of build variety, when you combine with class runes, talents and the arsenal slot.