Board Thread:Questions and Answers/@comment-28419884-20160509163934/@comment-27695048-20160509200359

Personally, to train my swords I generally just put them straight out into world 4 + 5 with a strong team (namely, Iwatooshi;;) to carry them and some troops, but considering you only started playing two days ago I don't think that's really possible. So, in that case, I suggest you run them through era 1 + 2 until they're around level 20ish? From then on, gradually progress through the eras depending on their levels. It kind've works out something like this:
 * Up to level 20: world 1 + 2.
 * Up to level 20-45ish: world 3.
 * Up to level 45ish-60: world 4.
 * Level 60+: world 5 (specifically 5-3, 5-4, especially since you can get some cool rare drops there too while you're leveling up your swords. ^_^)

However, tantous + wakis may have a harder time on the higher maps depending on their levels. So, I suggest once you unlock world 6 (which are the night battles) you train them using those maps because of their stat advantage!

You can also bring your swords to PvP + expeditions before bringing them out onto the front lines, and there's also an event going on right now that I suggest you take advantage of because of the high exp it gives.