The last part is untrue; the summon critical chance is fixed at 5% or 10% for Morning Star and Kaleidoscope respectively. This is stated by the wiki and I confirmed it to be true. (Until a few seconds ago, the wiki also said that Lightning Auras can achieve 35% crit with Kaleidoscope, which is untrue because whips do not affect sentries.)[Destroyer Emblem] provides the perfect balance of damage and critical strike chance, which is useful for all classes. As a summoner though, it's only better than the Summoner Emblem or Hercules Beetle when using the Morning Star or the Kaleidoscope, which allow minions to deal critical hits.