What does the luck stat do in Warhammer: End Times - Vermintide?

In Vermintide, it's possible to acquire a trinket which increases your luck. The trinket reads:

While equipped, your luck is increased by x%

_{(Where x is the value)}

What exactly does increased luck amount to? Reading around, there appear to be two theories:

• Increased chances of finding loot / loot die in a chest
• Increased proc chance of items

I play with a friend who has the trinket, and we allow her to open all the chests but I don't really notice any extra in chests (stuff seems to appear around 50% of the time) when she opens chests, vs when I open chests with / without her; however, I do feel like perhaps my item (which has a 8% chance proc) procs more often when she's in the party, but I can't be certain.

What does luck do?

Solution 1:

I can't confirm one way or another, nor do I have an official source; however, the Wiki suggests that trinkets which increase the luck stat increase the probability of finding Loot Die when that player opens the chest:

Trinkets which increase "luck" will increase the probability of finding a Loot Die when the player wearing the trinket opens a loot chest.

The Wiki also goes on to mention that the Luckstone trinket increases luck, which is the chance a Loot Die will be found when opening a chest:

The Luckstone increases luck, which is the chance that a Loot Die will be found when opening a loot chest.