Originally Posted by
Sparton_LOTB
To clarify, you get by default higher quantities of 3 Star evo runes in Brave New World, not the lower rarity ones. Lower rarity ones can drop in higher quantities, but they're rarer (and much rarer to drop at higher floors), but are still possible rewards to reduce the chance of lower-rarity evo runes becoming a bottleneck as you farm for higher-rarity materials.
It's also important to note that you'll get 3-5 3 star evo runes on average when that's rolled as a possible reward. It's the same idea as the Lord of Light; you'll still need to do multiple runs to get enough materials to evolve a talisman (just not as many runs as you'd need to get the materials to evolve a 4 star character from Lord of Light, since you're likely to have more talismans to evolve than characters).