ReallyJustDont: Thanks for the recipe
From front to back: TNT, COAL, FIRW, HYGN, OXYG. Doesn't deal that much more damage than just firw, but looks cool (both before and after explosion) and produces a bit of water. Make sure to surround it with at least a 2 pixel layer of INSL (which is flammable, so you can explode it later) if you want to keep it around for any amount of time.
Killaship2: There is 2 more layers, what should I fill it with?
What are some powerful, realistic and cool-looking layered combos for TNT?
Please look at the description!
I made a rushed dog if you unpause!