Epic:
Item Level 100
Insignia Slot: +150 Critical Strike
Insignia Slot: +150 Critical Severity
+80 Combined Rating
Legendary:
Item Level 200
Insignia Slot: +300 Critical Strike
Insignia Slot: +300 Critical Severity
+160 Combined Rating
Mythic:
Item Level 500
Insignia Slot: +750 Critical Strike
Insignia Slot: +750 Critical Severity
+400 Combined Rating