Limited Troops
In Gems of War, there are a variety of special troops that are only available outside of the standard Chests, or after a certain time frame.
Monthly Mythic
In chests for 7 days upon release
Then they are added to the rotating Mythic pool for crafting, in the Soulforge
Campaign Mythic
Rewarded by purchasing the Elite+ Pass in Campaigns, and collecting 1,000 Stars
Released into chests around 4 weeks after the Campaign ends
PvP Featured Immortal
Releases when a new PvP season begins
Immortal Souls are rewarded by purchasing the PvP Season Pass or can be found in Burning chests
Once the Season ends, the Immortal Souls are only available in Burning chests
New PvP Immortal
Releases when a new PvP season begins
Immortal Souls are added to Burning Chests
Once the Season ends, the Immortal Souls are only available in Burning chests
PvP Seasonal Mythic & Legendary
Releases when a new PvP season begins
Appears in the PvP Shop
Once the Season ends, they will become available to craft in the Soulforge, as part of the rotating pool of craftable troops.
Tarot Troops
Some are available as a reward during Campaigns
Also, some are available in the Kingdom Pass
Both go into the Vault at a later date, after the event ends
Hoard Mimic
After encountering the Hoard Mimic in Explore battles, it has a chance to drop a copy of itself as a reward
Underspire Treasure Guardian aka Sentinels
Chests that appear in dead ends after you defeat a Treasure Guardian in the Underspire, have a chance to reward these troops.
Previously Guild Wars Exclusive Troops
These are now available in normal chests, making them no longer a limited or exclusive troop.
Soulforge Exclusive Troops
These troops are only available to craft in the Soulforge and are not available anywhere else.
Xathenos
Zuul'Goth
Dragonlord Luther
Dark Smith Drenza
Ctharrasque
Enraged Kurandara
Hatir Ascendant
Skroll Reborn
Leonis Tower
Diamantina
Stellarix
Chrysantherax
Gem/Cosmic/Flower Dragons
Their Egg can only be crafted in the Soulforge, which has a random chance to drop of the matching Dragons
Gnomes
Gnome-a-palooza Gnomes have a chance to drop as a reward in Vault battles against them
All other gnomes have a chance to be rewarded from Vault battles only
Faction Troops
Available from Chaos Portals by spending Chaos Shards
Seasonal Imps
Only available during their corresponding season (Northern Hemisphere) in Chests
Imp of Love - February & March
Spring Imp - April & May
Summer Imp - June & July
Autumnal Imp - August & September
Spooky Imp - October & November
Winter Imp - December & January
Doom Troops
Available during Tower of Doom event weeks, in the Event Shop