Desert and Hellstorm

attention! The boss is now summoned so that with the ancient core you need to poke the soul block
 of sand! but summoning the boss using bone blocks remains! you call in the same way as in 1.12.2, that is,
 you place blocks of bones as if you were summoning a wither, but you don’t put anything on top, you just click on this
 structure in the center to summon the ancient boss of the construct