So, turns out Fatigue isn't possible because we don't have a way to really track who was deployed on a previous map. Oh well. It's not good, but we'll think of something. In the meantime let's have a look, at Anna, the wandering merchant.
There are two houses, one in chapter 1 and one in chapter 2 that both inform you of Anna, the wandering merchant
The simple fact is, having the on-map shops that FE6 had with the unlimited weapon system is... a bad idea. So rather than redo and reinsert the maps without the shops (or just kill the events.) now if you visit a shop and it says "Visit" rather than "Shop" that means a certain red head is waiting for you.
Anna will offer an item that is not readily accessible in the game just yet, such as in Chapter 2, she offers the player a Steel Sword
Of course, there's the downside. Anna is offering a Steel Sword for 3000 Gold, when the weapon costs 2000. However, the weapon wont appear in Merlinus store until Chapter 15! So now the player has a quandary, do they buy the weapon now for the tactical flexibility and increased mt, or do they skip it?
Of course... you could use that power.
Of course... what if we somehow managed to have less than 3000 gold on chapter 2 when we should have 10,000?
And there is one final important note. Anna will join the base as the Rare Weapons merchant, however she will only do that at the beginning of the Bern arc, OR if you have purchased an amount of items from her. So depending on how much you desire access to Defenders and Reavers and Guardian Lances, you may be balancing your funds to fuel your army.