The Advent of Phantom (Gerard/Natalie) Note: You can use this strat for other "The Advent of Phantom" run (not just for the mono-Thunder) if you can't beat it using a mono-element. Though you will miss 2pcs of soul shards for not bringing the specified mono-element. What's great is that you don't even need to have your own Roxanne as long as you can borrow one. Meaning even a newbie can make exploit of this. Introducing our opponent, they are of group of Saga slime called Jam (they are 7). They are highly resistant to elemental damage whether it is physical or magical, and comes with 4k HP. As for their way of obliterating your party, they have this signature move, an AOE attack that can inflict Disable Heal (although not potent enough to affect Turn of Tables) which is very annoying, a spit with mini AOE that can inflict Poison (the damage is high), and some other less notable moves of theirs. The Jam is immune to Silence, Paralyze, Poison, Charm (i will list what i only know) but has half-resistance against Delay and Stop. You only need Vaccine against Poison since Disable Heal doesn't meet its expectation. Your fragile unit should be at Slot 2 (such as Lucretia, Usalia, Fujika). Your sacrifice (must be tanky or evasive) should be Slot 3 and Slot 4. Your sub is something you can use of like Mei Fang who can inflict Stop from a distance. If you have Gilgamesh, you can have him equipped with Divine Shelter to be ultra tanky. He is nice as a lurer. As you can see from the video above, i use some of my unit to attract the enemy to cluster together. As you luring them altogether, you should as well start chipping their HP. You can only kill up to 2 Jam otherwise a giant dark slime (with 9k HP i believe) called Giant Jam will spawn (5 of them i can't remember right). Kill 2 Wind Jam since it is the element you are weak against. If you are using Delay or Stop, i suggest you target the Water Jam or the enemies on the upper left. If you kill all the Giant Jam, another set of mobs (they are 4 i think) but this time they are not slime (some kinda weird looking humanoid thingy).