When do you get the bomb?

[Жарпица]

To destroy Cliff portals you need a bomb? Where can I get it?

[Kallipygian]

From what I have observed, you need to have the metal upgrade. Then you need to upgrade 3 walls in row so if there is room, another building will appear that lets you build the bomb as well as the upgraded knights.

[Zeke]

to get the forge for the bomb, you need to:-
1, maxed out your castle, it wont spawn until your at the final stage so you need the final level upgrade and upgrade to said level (iron mine, island 4)
2, maxed level wall for the area it would spawn (you need the walls at iron level too before it will appear in an available space)
3, you need an empty area big enough for it inside said wall's, its a big thing and takes up 1.5 more space than all the other "shops" as it has 2 build options, as you can build the bomb on the left side of it and swords for your knights on the right