Q:
Can't craft agony infusions ?? Why ??
A:
you need to discover them first,
in ur discover tab
use +1 agony resist(2 pieces) and the reagent(1 piece) ,the one used for ascended stuff,sold from the master crafter vendors.
repeat the process for higher versions +2 agony resist(2 pieces) and 1 reagent,etc
Thanks dude ,