Dark Spectre Armour is a War Mode Armor. It is the same thing as the normal Spectre Armour but, it has more defense. To get the Dark Ectoplasm in the crafting recipe, you need to kill Dark Wisps in the War Mode Dungeon.
Stats[]
helmet 25 defense (with mask) 12 defense (with hood)
chest/robe 18 defense
pants 15 defense
Crafting[]
helmet (mask/hood) 15 Dark Ectoplasm 15 Chlorophyte Bars
chest/robe 15 Dark Ectoplasm 15 Chlorophyte Bars
pants 20 Dark Ectoplasm 20 Chlorophyte Bars