For a full explanation, refer to the Official Peakd Blog Post by Yabapmatt.
What Does Soulbound Mean?
If a card is soulbound, it is unable to be transferred, rented/delegated, burned, bought or sold until the cards go out of print. It is tied to the account that has earned it through gameplay/chests. Gladiator cards are also Soulbound (How Do I Start Earning Crowns, Merits, and Gladiators?).
How Can I identify the Soulbound Reward Cards?
Soulbound Reward Cards can be identified by the chain in the bottom right corner of the card.
How Can I Get Soulbound Reward Cards?
Soulbound Reward Cards can be found in Loot Chests. The odds are listed in the table below.
Furthermore, you will be able to increase the odds of receiving multiple reward cards or gold foils by using Potions.
Which New Abilities Come with the Soulbound Reward Cards?
Summoners with the Conscript ability will allow you to add 1 additional Gladiator card to your lineup in Ranked play. In Brawls, up to 2 gladiator cards may be used with this ability.
When a unit with the Martyr ability dies in a battle, it gives adjacent characters +1 to all stats. Carefully consider positioning so that this unit is adjacent to two units rather than just one when it dies.
*The dispel ability removes the Bloodlust, Martyr, and Weapons Training effects
Units with the Weapons Training ability will “train” any adjacent characters with no attack, giving them an attack of the same type as the character with the Weapons Training ability. You may use one Weapons Trained Unit on each side of your no-attack card. You will receive both attacks if they are different, but if they are the same you will receive only one, the highest.
*The Oppress ability serves as a counter, as units with that ability will do 2x damage to units with no attack.
Will the Soulbound Reward Cards ever be unlocked?
It is possible that the Soulbound Reward Cards will be unbound in 1-2 years (subject to change), when each of them goes out of print (this will also required some sort of DEC burn to utilize them in an unbound form, details still TBA). When that happens, a new set of Rebellion (or the current set at the time) reward cards will be released.
Please feel free to reach out to tech support with any questions: Submit a request – Splinterlands
Best of luck with your Soulbound Reward Cards!