Charred wood and Scorchers

Charred wood and leaves-

The mechanic for charred blocks could be this, when a flammable block like wood is set on fire, after 20 seconds it will turn to its charred variant, then after another 20 seconds it will disappear.

Scorchers and Scorching Towers-

This is a new kind of illager, it wears an orange and red robe and shoots fireballs like blazes by waving its hands in the air. They could drop emeralds and blaze powder as a rare drop, also, they could be part of raids where they burn down houses, in desert villages though, they will focus on the villagers. It could have its own structure made from wood, charred wood and cobblestone, where they try to practice their fire summoning. (Its not very smart that they built it from wood though :)