Clash of Clans – Understanding Town Hall Grid Layout and Strategies

clash-of-clans

So I was looking at my friend's base and he was raided I noticed a weird grid under his Destroyed Town Hall. It's a square grid that starts from the outside with the color Yellow and gradients it's way to the inside to red squares. Any ideas what this is?

Town Hall 10 (Destructed)

Best Answer

Source

When a level 10 Town Hall is destroyed, the ruins are lying on a grate on top of lava.

Also, it is stated that

The lava in the level 10 Town Hall may be a reference to the fact that the Inferno Towers are unlocked at this level.

So, basically it is a metal grate (probably on which the town hall is placed) and below it there is lava.