Faction Packs are incredibly useful for ascending specific heroes of each faction, as it increases the chances of acquiring them.
However, only one type of faction pack is available per day.
They're rotated every 24 hours in a set order of Maulers > Wilders > Graveborn > Lightbearers.
Droprates:
Common Tier Hero: 51.69%
Rare Tier Hero: 43.70%
Elite Tier Hero: 4.61%
Below you will find a schedule for the faction packs during this month.