This is probably a question that’s been asked previously but I’ll ask anyway. Does the shrouding spore rule mean that if I charge with a unit of hormogaunts for example, and that unit is within 6” of my venomthropes, that they can’t be over watched as -1 to hit would require a 7 or am I being to simplistic because overwatch always hits on a 6?
Read the rules for overwatch again. There is an explicit instruction that it hits on a 6 regardless of modifiers.
Much like how a 1 is always a miss even if you had a +9 septillion to the roll, a 6 is always a hit for overwatch even if you have -94 quadrillion to the roll.