Epic quality

Epic quality is one of the five Quality levels used in vanilla Factorio to indicate the relative strength of item or equipment modifiers. Quality levels are represented by names and an associated numeric strength value; higher numbers correspond to stronger effects. In the standard progression, Epic occupies the fourth position and carries a strength value of 3.

The complete set of Quality levels and their strength values is:

• Normal (0)
• Uncommon (1)
• Rare (2)
• Epic (3)
• Legendary (5)

The numeric values shown above are the in-game strength tiers applied to modifiers or bonuses conferred by items, equipment, or other mechanics that use Quality as a parameter. The Normal through Rare steps increase by one numeric tier each, but Legendary is notable for having a strength two tiers higher than Epic rather than one. This means Legendary (5) provides a larger jump in modifier strength compared to the increment between Rare and Epic.

Practical notes:

• Epic (3) is a high-tier Quality and is typically more desirable than Normal, Uncommon, or Rare in contexts where Quality determines bonus magnitude.
• When comparing items or effects, compare their Quality numeric values directly to determine which offers the stronger modifier.
• Keep in mind the exceptional gap between Epic and Legendary: a Legendary item usually outperforms an Epic item by a greater margin than the difference between adjacent lower tiers.

This Quality system is part of the vanilla game's item/equipment modifier framework and is used wherever the game refers to Quality levels to scale effects.