Gem chest drop table?

[Spherix]

I get to use this again!

Beards of War

As of this week, we’ve made a change to the way EVENT troops appear in chests after their release. Now, each event troop should begin to drop from chests 4 weeks after its initial release (so it won’t be a simple case of the chests updating at the start of every month with the previous month’s troops) Mythic Troops & troops released with new kingdoms will be unaffected by this.

Troops released in weekly events aren’t available in chests for 4 weeks, so that’s why it says that the chest contents will change. Otherwise, you’re correct: gem chests contain any available ultra-rare or better troops, and any runic or arcane traitstones.