The effect of the Power of Delusion is similar to a Seventh Rank .
Indeed, the Limited Prayer Technique is not as omnipotent as the Ninth Rank Prayer Technique, but it is still quite formidable. It can remove most curses or abnormal statuses below the Seventh Rank, resurrect recently deceased individuals, and create some "miracles" within the Seventh Rank range. More importantly, the Limited Prayer Technique can simulate various spell effects not higher than the Sixth Rank.
For someone like Ybur, who has already reached the Eighth Rank in combat power, how useful can spell effects not exceeding the Sixth Rank still be?
The answer is… extremely useful.
Because the focus of spells is not on the extent of damage they can cause, but on their functionality. And the strength of the Prayer Technique and the Limited Prayer Technique lies in their ability to break professional limits, allowing cross-profession spellcasting, thus causing a dramatic increase in functionality.