I worked backwards since I was already going to field my 5 ideal units on Thor, which is Leon, Ledin, Tiaris, Yulia, Elwin. Leon/Tiaris/Yulia/Elwin at 6, Ledin at 5. Also I guess my troop training would technically be above average, since I "just hit 70", but I did so pretty slowly so I had more time to gather resources, and also was able to leech off my actual account for events. I maxed Phalanx/Lava Titans/Angel/Vamps/Sorcs, and basically only level Lancer/Flier and some Infantry/Mage/Holy. Flat stats for Lancer/Flier are maxed. Flier training is 40/60/40/40, Lancer at 56/32/60/60. Masked Maids for Elwin/Yulia are maxed, but Infantry training isn't great at 36/44/36/36. Mage is about the same.
The first stage has a dog cavalry, 2 lancers, skele archer, and 2 dwarves. To me, the largest threat here are the dwarves with Deadeye, and you can't mitigate damage through triangle. I would probably put Vargas and the other 4 should be high movement units like Sonya to kill the Dwarves, someone to disable/go through guard, Imelda or a Mass Protect to block the Rout and Acid Burns, and possibly Alte or Lanford's FB since Imelda can double as a mage to help kill the Rock Lancers and be Holy to fight the Skele. My clear is Vargas, Alte, Imelda, Sonya, Liana, but I'm stuck on the 2nd stage without using my main team.
Ideally, if I had a Lancer Landius, I would build a team around him here instead.
Second stage maybe I'll swap Vargas in here and put Freya in the first stage. You have 2 cavalry this time and a Flier. Even if I had Narm built, I barely invested into Archer/Assassin, so it would have to be Ullr's/Angels, which isn't enough to kill the Flier in 1 hit, not sure about 2. Freya can tank the cavs, especially with Sophia, but she does like 0 damage. If I had a built Lana, I would bring her to kill the Orc, but she's 3*. I might just put in Leon and slot someone else like Cherie in for the Thor stage or wait on building my Tjess.