Decado's mules hold some of the finest equipment in the game. His loot list includes:

2 Scintillating Gems

1 Small shard + 1 dark shard

1 Pyreal Bar + 19 motes

Nearly 50 Sturdy Iron Keys

4 Lich Seals

A Dark Revenant Thighbone

and of course, over 1 Million in Pyreals

Have a look at the following picture:

See? :)

(The highlighted gem is a scintillating gem, as is the one beside it)

With the above loot, you can do many things. Outfit the members of the new allegiance you want to form? Trade some of it for items you want or need (not that you need much more :).