If you are having an error while opening the client today - please follow the steps:
1. Go to %appdata%/Kasteria/Kasteria_v3.0
2. Copy lootconfig.otml, config.otml, minimap.otmm and hotkeys_1.otml
3. Remove Kasteria_v3.0 directory
4. Open client again
5. Close the client
6. Paste previously copied configs into Kasteria_v3.0 directory
Voila, client supposed to be open without any issues!
You are able to kill up to 1000 creatures each task.
The value of the reward depends on the number of monsters you choose to kill, in table below you may see reward value for 1 kill.