A THREAD FOR NEWCOMERS!

How can I defeat the ranged Dungeon and Castle? The creatures just approach and die from direct hits.

You need the following skills: tactics (essential), air, and earth magic. Speeding up or slowing down creatures works wonders. Remember that, for example, Castle archers deal 4 times less damage in melee combat than when shooting. And it's almost embarrassing to talk about their hit points.
And, of course, don't forget about the wyverns from the Hive and the angels from the Conflux.