Board Thread:Questions and Answers/@comment-174.95.255.32-20160503000553/@comment-26501688-20160503052525

Level 20s is too low for world 4. Definitely you'll need to level them up more. The level cap for each map is a pretty good guide. You can probably go back to world 3 and stay there for a bit. Just be careful not to spawn KBC on all maps or you may have trouble training future new swords. For me, a good indicator to switch them to the next map is when they stop losing an entire troop in one sortie. If you find yourself having to withdraw your team before the end of the sortie to preserve troops, then it's better to go to the previous map and train some more.

I like to train a variety of different swords together because all swords are useful and it's always good to have a variety of swords at decently high levels. For tantous, what people typically do is train them up to about level 40+ and then send them to world 6. Tantous generally don't do well in world 5.