This is the last of Horace's puzzles.
"...which means you must have seen it. Think! I wanted people to know what they look like. Perhaps... what they wore? Yes... that makes sense! The robes they wore are described somewhere in that book, along with a warning. You must know where it is!"
Solution[edit]
Read the Wizard's Robes section in the equipment page:
It says:
"Noble vestments woven using an ancient method. Those who wear such robes are known to bring miracles in their wake"
The letters in red spell "Beware" which is the warning Horace was talking about
The answer is:
WIZARD'S ROBES
Reward[edit]
Astra Spell