This boss is very tough and possibly one of the hardest of the game so far. However using a certain strategy can make it easy for underlevelled players. Armaros Manifest has several attacks: Aerial and ground attacks, down strikes and Stone Rain. It can summon 5 minions at a time, which should be dispatched as fast as possible when summoned. Arumat is very effective agaisnt these. As for Armaros Manifest, blindside it when it's about to pounce you and spam Special Arts on its core at the tail, preferrably with Bacchus' Galvanic Shock.