He most likely has a thunder hammer, which is very cool but won’t necessarily make him much better than the power fist we currently have access to. Warlord trait or a special aura or something could make the difference. Having more legion-specific characters is nothing but a good thing!
Yeah personally the Thunder Hammers are far better then power fists, that straight D3 is fantastic. Other then that identical.
For his price point hes a solid "babysitter" for a unit for Heroic intervention or for a counter-charge the following turn. (this is of course assuming he is geared with what he looks like lol)