How can I get stone block?

Stone block can be bought from the Alliance store. You need to donate resources to the alliance to get contribution points. You can then used these points to by Stone Block (Bunch o Rocks).

During Reign of Chaos events you can also earn it from occupying plots and killing the Wight King special monsters.

You get stone blocks in the alliance store. The more you donate to your alliance the more points you get. Use these points to get rocks in the alliance store.