As the title suggests, i really like the dynamic of a space marine just showing his absolute dominance and controlling everything. Books like "Helsreach" and "Deathwatch"(Steve Parker one(also the sequel)). I'm not very strict on this criteria being used with just humans or guard, books that have space marines showing who's in charge to other marines is also cool, similer to Dante in Devastation of Baal letting everyone make there choice, but rule totally after that. Thanks!