Rune Drops
Runes drop only from boss encounters of level 40 and higher: each cleared one has a 2% chance to drop a rune, 1.5% on mini-boss stages. Only runes the current hero's class can use drop.
Rune types
| Rune | Share of the runes |
|---|---|
| Attribute rune | 54.07%, 53.33% on Inferno |
| Ability rune | 42.96%, 42.37% on Inferno |
| Grand rune | 2.976%, 2.935% on Inferno |
| Set Rune | 1.37%, Inferno only |
The shares are before the loot bonus and include Solo Self-Found, which every offline character has: it doubles the Grand rune weight (1.5 to 3) and the Set Rune weight (0.7 to 1.4). The Grand rune weight (3) and, on Inferno, the Set Rune weight (1.4) are multiplied by the stage's loot bonus and by (1 + 0.2 x Item Find); the attribute rune weight (54.5) and the ability rune weight (43.3) are not.
Drop chances are the game's rules for offline characters; the game server decides the loot of online characters.