Re: (Nutaku) Milenium War Aigis (English Version)
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The top half is what I consider my normal mix of bring to battle units. Archers are horrible for this event so I'd sub one for Solano. The units in the bottom half are what I have trained enough that might make a difference in the map.
I'll try to help as much as I can.
All my accs started the same way:
1 - A, weaker soldier
2 - B, stronger soldier
3 - C, witch (you can use Despara - just wait till dwarf will be about to get in her range, put her and skill on)
4 - D, healer (preferably the strongest)
5 - F, if you want to use Solano (she's troublesome because of the timing, you can always change her a bit later with normal mage, but not after valkyrie!!) or just use Odette. If you chose Solano use her skill when last two dwarves just passed H point.
6 - E, Bernice
Now quick automatas are coming, use Bernice skill if it's available!
7 - you must focus here soldiers skills should be available very soon and you have to withdraw Despara before gunners take her down and put in this place second healer, but before that, withdraw soldier from A and put prince. The order of that depends on availability of soldier's skills, Despara's survivability and overall hp pool of units. You can always withdraw Despara a bit earlier just to be safe and put healer if you have UP.
8 - H, blocker
9 - Efreet shows up. I had Echidna so she's quite tanky and I could put valkyrie first, but you dont have her so... Well your Katie is much better than mine (first acc to 3 star had here 40lvl Aria 50% aff

) so she should be able to survive till Efreet will be about to leave the map. He'll be out of range to attack so you put your 3rd healer on G
10 - withdraw soldier on B and put Kerry or Rowanna
11 - withdraw unit on H when it'll be in Efreet's range. Now watch and use skills wisely, especially healers when efreet starts bombarding you.
12 - put blocker on H again. Depending on DPS you will want to use hear Leanne or Saki (her assassination might kill enemies fast enough).
13 - Use Kerry/Rowanna/other duelist to block Efreet on I. Watch carefully though, you dont want to block automata (you can slow down efreet earlier too, either blocking or giving him a target e.g on H)
I hope I wrote it understandable enough. Hope it'll go well for you without much adjustments. My main problems were quick automatas escapes because blockers were busy or bad timing with Solano's skill -,-' Using her was really frustrating.
Probably your biggest problem will be lack of Echidna. Hope your gunners won't kill 3rd healer. And if you decide to use Solano and change her later for Odette, try to do this before you swap units on B or else she might be killed by automatas.
Good thing is your units are much higher lvl than mine, so I think you should be able to do this without big problems.
Edit: there are also J and K, but I thought Miho (again, not sure of the name) is healer/witch not witch/healer. So just forget about those.