Board Thread:Question and Answer/@comment-24596086-20150324191911/@comment-25435121-20150402172248

Airship is one of the more useless buildings, but in my opinion one of the best looking. It's not worth building until after you've completed level 10 of your castle, which costs 2000 jewels. As a free player, you should be saving all your jewels for castle level 10.

For "Assists", you can only request help with Archwitches (AW) and Fantasy Archwitches (FAW). The Archwitch page has more detailed information, but the basics is that when you die, you'll see a button for "Request Reinforcements". If you press this it will allow you to pick 5 comrades, plus your Alliance if you belong to one. If you choose your alliance, everyone in the alliance can assist. This is a good reason to be in an active alliance, as it gives you many helpers. Also note, that if you fight the AW or FAW a second time, and lose again, you can request 5 more comrades, and do this as many times as you have BP.