The most searched ones, each with what every copy adds, what it pairs with and who uses it best. The rest are in the lists by rarity.
The rest, by rarity: Common item · Uncommon item · Legendary item · Boss item · Lunar item · Void item.
Sources: the game's English text (name and description), the Risk of Rain 2 wiki (riskofrain2.wiki.gg: this item's page, read on 31 October 2026; numbers, stacking formula and notes) and the wiki's survivor pages. The plain-words text and the synergies are ours. Icons: Risk of Rain 2 (Hopoo Games / Gearbox).