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To kill 6 wraiths:

36 wounds. 54 if they have RP. 72 if they have RP, are part of a Decurion, and you haven't killed the Spyder first. Hence: kill the 3 wound 3+, 4/5+FNP Spyder

Assuming the first (or after you have killed the spyder), you probably need to get about 43 str 7 hits on a wraith squad to kill it. Supplement your quality shooting with weight of small arms fire, therefor, to kill wraiths. Be aware that one wraith can still kill a serpent with some decent dice, so dont buy into reducing the squads. You want to kill them.