Ni No Kuni Wrath of the White Witch: Horace's Second Riddle in Ding Dong Dell

You see the monument here? It has some Nazcaan runes on it. They're a clue to something in the Wizard's Companion. Can you work out what it is?

Solution

Translate the messgae using the Nazcaan Script:

Remember to read from right to left

llewuoyevreslliwtahtrehtonaekamotllepsdnocesdnatsriffoekortskcalbxim

You get the phrase:

"Mix black stroke of first and second spell to make another that will serve you well"

The first two spells are:

Form Familiar

Gateway

Unleash uses the same strokes

So the answer is:

UNLEASH

Reward

Thunderstorm Spell