Invasion Rewards

The Ruushi Invasion 2.0 reboot introduced new rewards on a sliding scale for participation and overall effectiveness.

From the in-game help file:

Invasion rewards:

NOTE: The spoils of war feature is not yet active. It will be
introduced soon - keep an eye on the MotD!

At the end of each Invasion, you may visit Commandant Vai-shan to
request your reward. The rewards that you may earn for participation
in the Invasion event include:

1. Platinum
At the beginning of each Invasion, Christof assigns you a title 
(recruit, scout, soldier, officer, or general) based on your rank.
Your base platinum reward is dependent on this title; higher ranks
have higher earning potentials. Platinum rewards are also boosted 
slightly if the Invasion leader is defeated.

2. Faction
Ruushi Faction is a unique currency, used to purchase special
prizes which can't be obtained elsewhere. You can view your total
faction by visiting Krijjkar. The death of the Invasion leader
during the boss wave is the primary source of faction for all
defenders. The defense's overall performance in special missions
for Tyf and Shaker can also modify the faction award somewhat.

3. Spoils of war
On occasion, exceptional treasures may be obtained from the
defeated Vl'lakian forces - precious metals, valuable crafting 
materials, rare inscriptions, Vl'lakian relics, and other such
riches. Your reward may sometimes include these spoils of war,
but only if you have received a ceremonial accolade for your
defense of Ruushi! (These accolades may be purchased, with enough
faction, from Krijjkar.) The more accolades you have received,
the greater your share of the spoils of war.

All awards are strongly modified by your personal contribution (the
amount of effort you've put into defending Ruushi from the last
Invasion) and the overall damage that the city sustains. The 
greater your contribution, and the lower the damage done to Ruushi,
the more impressive your rewards will be!

For basic information about Invasions, see 'help ruushi invasion'.