Ancient civilizations may rise and fall, but which House will last forever? This function throws it back to “old way” vogue for “March of the Mummies,” where competitors emulate the performance style of their founding mothers. Next up, the Houses draw their swords, and push their bodies to the limit, to deliver unforgettable floor performances in “Warrior Guardians.” Guest judge Kelly Osbourne shows some major ballroom love as an emotional battle between the bottom two Houses unfolds.