Erm...just drive into him and let him break himself I guess, as the armour is impenetrable? It's tougher than a neutron star, guys...

If necessary, hit him with the axe, which strikes with more force than a reasonable size meteorite.

Maybe I should use the blunt axe head, rather than the ~10^-18m tip one...blowing up the universe wouldn't be quite such a good idea I fear.