Briefing
As time passes, waves of stronger and stronger monsters will attack, with nowhere to run and the need to defend the crystals behind you, which give some ability to kill the monsters to improve your own attributes, or you can sign a contract with them to fight alongside you.
Summary
As time passes, waves of stronger and stronger monsters will attack, with nowhere to run and the need to defend the crystals behind you, which give some ability to kill the monsters to improve your own attributes, or you can sign a contract with them to fight alongside you.
