[@Witch Cat] well it's not just a cat it'd probably be a cat that then grows to the size of a bear and would easily kill a man. These are demons not pets. They even have language its just only demonologists can understand them. And the familiar thing only applies to demonology.

As for minor spells or cantrips yeah you can snap your fingers to make little spells happen, but that's little stuff compared to your skills. Markiel could easily do some rather impressive offensive magic without a wand, but he's from a long line of warlocks, trained since he could speak, etc. Anything at your average or above will need the implement. Thanks to the spatial part of infernal magic familiars can appear by their master's sides whenever needed so it really isn't any trouble.