An ancient book titled The Only Sun on the Sky.
It is not known when anyone wrote down, but it contains knowledge of the heavenly bodies.
It resonates with Ancient Hero's Boots.

Every 2 refine levels, ATK +10.
Every 3 refine levels, MaxSP +2%.

Refine Level +7, increases Prominence Kick damage by 15%.
Refine Level +9, reduces after attack delay by 10% (ASPD +10%).
Refine Level +11, increases Solar Burst damage by 20%.

When equipped with Ancient Hero's Boots:
Has a chance to increase STR by 20 and ATK by 15% for 7 seconds when dealing physical attack.

[iRO Description]
Ancient book with the title of the only sun in the sky.
It is not known when anyone wrote it, but it contains knowledge of the celestial body.
It resonates with the Ancient Hero's Boots.

ATK + 10 per 2 refine rates.
MSP + 2% per 3 refine rates.
When refined to +7 or higher, increase damage of Blaze Kick by 15%.
When refined to +9 or higher, reduce delay after attack by 10%.
When refined to +11 or higher, increase damage of Solar Explosion by 20%.
When equipped with Ancient Hero's Boots, adds a chance to STR +20, ATK + 15% for 7 sec when physical attack.
Type : Book Attack : 160
Weapon Level : 4
Required Level : 100
Class : Star Emperor