Since the official post for the week's event hasn't been posted here yet (It has since been posted.)

But it was posted on the Gems of War site…

And for those who would like to figure out the scoring…

World Event: Scales of Justice

There are 6 battles that players can encounter during the event: Scale Assassin, Mist Assassin, Kobra, Viper, Euryali, and Mambasira. The first 4 battles to appear are randomly chosen, but they all have an equal chance of appearing on the map.

Then a battle will appear against either Euryali or Mambasira. After that, all battles reset, and you’ll need to fight another 4 battles to spawn either Euryali or Mambasira again.

You can find the following rewards for each of the different battles you may encounter.

Scale Assassin: 1 Antidote

Mist Assassin: 1 Antidote

Kobra: 4 Treasures

Viper: 4 Treasures

Euryali: 2 Antidotes

Mambasira: 8 Treasures

Each Antidote is worth 20 points, and each Treasure is worth 4 points. The battles against Scale Assassin, Mist Assassin, and Euryali each drop a variable number of Antidotes (on average about 1.18x the base amount). As battles get harder against Kobra, Viper, Mambasira, they will increase the amount of Treasures given by 25%.