hey , you dont need to do nothing in order of mechanics. Yes it have mechanic, but only one person is usually in charge of making them, since if everyone tries it, it is impossible. You have to make some special traps in grimvile and then make feroxa pass over it, this part is usually done by 1 ek while everyone is watching him.
There comes a moment when feroxa is weak and you can hit him with normal attacks, at that moment you have to attack Ferox to get the bosstiary and the chance to get the helmet.
Here you have the wiki link,
https://tibia.fandom.com/wiki/Feroxa there they explain it in more detail