Tier I - Turn your cheapest units into large, deadly armies. Specialize in summoning and buffing low tier units.
"Masters of the Horde understand the power of large numbers, of masses riled up into a frenzy. Ultimately, our hounds of war will tear apart the strongest knights and most cunning warlocks. Our enemies' biggest mistake is to underestimate how many thralls we command, and how little we care about their lives." - Swarmcaller Trass, Ratkin War-chief