To tame these guys you need to get them below 50% health (I might be wrong it could be lower) and apply the β€œdoused” effect to them, which you can do simply by having it rain or putting it in water

After that you must ride the Pyromane and fight creatures/absorb fire (ctrl + right click, and I think L1 R2 for console)

Upon riding you’ll notice a timer, this is until your are dismounted and put at risk of attack from the Pyromane however it will reset upon killing a enemy or absorbing fire (unsure about killing enemy)

This creature can be a difficult and confusing tame however it is worth it

More Pyromane Taming & KO Tips