The Shadow Siren v0.5.7

Add fix for Invisible Lagavulin
Balance Changes:

• Frostfire rework, now conditionally hits twice if the enemy has Chill, damage increased 4 -> 6(9)
• Plasma Beam now applies 1 Vulnerable, damage lowered 9(12) -> 8(11)
• Discharge multiplier reduced 3(5) -> 3, damage increased 5 -> 5(8)