Stacking

[Guffy]

I was wondering do the items stack? and what is the limit for each item, thank you very much.

[Lord Regal]

Items stack, no limit that I’ve encountered yet (highest I got was an 8 stack of armor piercing rounds)

[Backstabba]

The item long page if you select the item says what items stack and how they stack.

[gachi is manly]

You can check your logbook to see what stacking the items do.

Not all items are doubled in effect when stacked. For instance the ATG missile launcher has a 10% chance to proc no matter how many you have, just the damage increases. Armor Piercing Ammo gives you 20% extra boss damage for the first one, but only 10% per stack after that. Lensmaker Glasses, on the other hand, do stack 1 for 1 at 10% per stack. So at 10 lensmakers you have 100% crit chance.

[Kadji]

Also keep in mind that some Items have diminishing returns, especialy items that *reduce* stuff on a percentage base.

I recomend the ROR2 wiki page, even if it's still work in progress.
https://riskofrain2.fandom.com/wiki/Item_Stacking

[Lunacy]

Items stack pretty much infinitely, but some items have some weird caps like Tough Times.
And items like tri-tipped dagger (the bleed proc item) not sure if they even benefit you after having like 7 of them.

[Gimli]

They stack. I got like 18 Soldier's Syringes with the commando on my run (10 Lens Makers on top of that) It was tons of fun >:D