Was working out the modifiers for multiple attacks with the Aurum Genestealers from the Emperor Protects, which have Multiple Arms, Swift Attack, and Lightning Attack.
How do you work out the modifiers for each attack when a Genestealer uses the Multiple Attack Action? It's vague as written because they lack the Two Weapon Fighter talent and thus don't fit the usual mold for figuring this out. They also lack Ambidexterity, but that doesn't make a terrible amount of sense for something with four arms.