This super-duper headwear will protect you in case of battle against Mordred or Morgana or perhaps an orc. It’s even got magical properties to stop you getting helmet hair in case King Arthur takes a shine to you*.
The clever (and nice!) lady at Owlcrochet who created it and is also modelling it in the photo even translated the terms for us:
Wherever you see “dc”, do a UK treble crochet (tr).
Where you see “trc”, do a UK double treble crochet (dtr).
Thank you, Owl Lady!
* This may or may not be true.