Langrisser Mobile - Season of Conquest S2 - Challenge 2

The hardest challenge from this season. its a bit tricky but not impossible. the mechanic is simple, the boss have 40 stacks of 5% dmg reduction, he loses 1 stack for each "lvl up" stacks the attacker have. to gain lvl up, u need to clear missions that the commander npc will give u in form of terrain tiles. those can be: deal aoe dmg (red punch) kill a enemy (sword) use a support skill (heart) guard a ally (hammer) move 3 blocks or more before battle (winged boot) each fulfilled mission will give 1 stack of exp to the commander, when he has 5 or more exp, consume 5 stacks and applies lvl up to all allies. thats all, the rest is just survive and kill everyone, then go against the main boss. remember to bring some regeneration because enemies hits hard