Diablo III: Reaper of Souls

got my demon hunter to 70, helltrapper is really silly

if you have the sentry turret skill on your bar with the spitfire turret rune, the rockets your turrets fire can proc the helltrapper effect, if you have multiple turrets out, it procs SO MUCH

also, helltrapper summoned turrets don't count towards your sentry skill limit
so if you have the engineering passive, you can manually summon three, and your helltrapper can summon in two more, for five total turrets

and then if you have the quiver that allows you to summon 2 more... you have seven.