Sandekala is the followers of Kelana, the evil entity which plans to rule the world (or Marcapada, as the comic says).
What in the world are Sandekala, Kelana, and Marcapada? The doodle above is a fan-doodle based on my favorite web-comic (recently), NusantaRanger. The comics are made in Indonesia, so yes, it's that awesome. The words above are the most important keywords (I think) in the series.
'Nuff talking. The point is, they're the bad guys. Their level is just below the boss, in this case, Kelana. And BAD GUYS. ARE. AWESOME.