Flamesteel can be found in the nether and you can craft Tools, Weapons, and Armor. When you wear the armor you will be fireproof! You can walk through fire and lava without taking damage and its better then diamonds.
Flamesteel tools will be the same way, it will be easier to break blocks and much more. The sword has a really cool feature that has a 30% chance of setting mobs on fire.
Flamesteel ore will blend in with netherrack so you must keep a close eye, it spawns at around 12 blocks all the way up to 20 so you can find it almost underneath lava all the time. there will be many changes and bug fixes, but for now its a little on the op side. PS we will be updating to all of the 1.16 versions when the software we use gets updated! Also make sure to have fun!