The Demolisher will begin to appear after reaching a gamestage of 153. It cannot appear outside of Blood Moon Hordes, regardless of gamestage (again, as of Alpha 19.3).

How do you deal with demolishers?

When all the Virals are dead, go back to the Demolisher and go back to swinging at its head. Use the gas pipes or a piece of Heavy Rebar from Goons to break the helmet then use the arena machete to kill it. There are some firecrackers on the top of the containers, use it to distract the Demolisher or the Virals .

What are zombies attracted to in 7 days to die?

Crimes Against Nature. Felling one or two trees will affect nothing, but chopping down many trees within a small area will exponentially attract more zombies.