An Angel christened them the Army of the Four Sage Beasts after they had gathered on Radiance's sacred lands.
[Ascend: Shadow or Nightling] (As an additional summoning cost, you must place all cores from one of your Shadow or Nightling spirits into your reserve.)
[LV I][LV II][LV III] When Summoned
If this spirit performs [Ascend] using a spirit that costs 6 or more, remove one core from each of your opponent's spirits and nexuses and place them into their trash.
[LV II][LV III] When This Spirit Attacks
At the start of the step, place a core from your trash that is not a (soul core) onto this spirit for each of your spirits with [Luster].