Oppressed people? It is level 1, there comes something down from the sky (a heavy rock) with 'music' (the sound of weapons), the 3rth clue points to WATER, its attribute, the 4th clue points to the group-being...
The 3rth clue also points to its massive defense (2000 points), the first clues also point to the fact that people tend to sing and be joyful if they are released from oppression...