Fire Emblem Fates: Revelation Chapter 21 Walkthrough

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Alright, Chapter 21! This one's called "Going Forward," and it's set in the Cursed Ruins. Your main goal here is pretty straightforward: defeat the boss. But like always in Fire Emblem Fates, there are some twists to watch out for.

Walkthrough

1
You'll start in the Cursed Ruins. The map has a really interesting mechanic: special tiles that change enemy classes. Red tiles will promote enemies to advanced classes, while blue tiles will revert them to base classes. This is super important because it can lower their stats and make them easier to deal with, especially if they can't use their promoted-class weapons anymore. Try to lure enemies onto the blue tiles whenever you can!
2
Don't worry about experience gain; it's not affected whether an enemy is promoted or not.
3
There's a Dragon Vein on the far right of the map that can actually swap the effects of the red and blue tiles if you need to. It's not mandatory, but it's a nice option to have.
4
Make sure you bring a unit with the Locktouch skill. There are a bunch of chests scattered around the map, and you'll find more goodies in them than you have Chest Keys for.
5
As you push towards the final room, you'll encounter Anthony. He's now a Faceless and will come after you aggressively, using his full movement range. You can't just stall forever.
6
Be aware that reinforcements will start appearing on later turns from the north and will try to flank you from the south.
7
Anthony, as a Faceless, isn't too tough. He can't attack from range and has low Resistance, so he's not a super difficult boss fight.

Tips

Abuse the blue tiles as much as possible to weaken enemies.
Bring a Locktouch user to snag all the valuable chests.
Anthony is vulnerable to magic due to his low Resistance.
Keep an eye on the north for incoming reinforcements and position your units accordingly to prevent being flanked.

The primary reward is progressing the story and defeating Anthony. Specific item rewards are found within the chests on the map.