Reference

Upgrade pools

Every unit rolls exactly one upgrade, drawn from its upgrade pool. The upgrade pools are intentionally curated to prevent both useless rolls and oppressive upgrades.

How rolling works

  • One upgrade per unit. Research locks the moment you start it, so a unit cannot take a second.
  • Useless rolls are curated out. Corrosive Bile on a Battlecruiser would do nothing worth the research, so it is not in that pool.
  • So are oppressive ones. A Tempest with movement speed already outranges everything and could kite forever, so it cannot roll it.
  • The roller limits repeats. You will not end up with the same upgrade spread across your whole army. The draft keeps variety in every game.
  • They are not all the versions you know. Several upgrades do more here than their StarCraft II counterparts.
  • Caster spells add energy regeneration. Researching one gives that unit +25% for the rest of the game.
  • Research happens at the tech buildings. Barracks units at the Ghost Academy, Factory units at the Armory, Starport units at the Fusion Core.