Dark Crystal is a free game, in which you can use various types of weapon known as skills(more to come soon). To add a motivation for you to level up faster, a requirements is needed before you can use a particular skills which can be bought from shops or obtained from bosses.
From almost every boss, a very unique equipment(s) can be obtained immediately after defeating them, with a chance.
Although hard to be obtained, the skills are each made very special, thus, making your character even stronger and the money you spent worth it.
***Some of the notes stated above is not available at the moment. It will be made available at a later version, with some of the skill's damage changed.