Converting Extols into Merps
Eren had covered his basic needs of movement, defence, attack, and AoE with the spells he had selected for himself.
The stars in front of the spells conveyed their effectiveness.
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Spells are also ranked as per their usage by ranked entities. That means there are F-Rank Novice spells for F-Rank Novice rankers, E-Rank Ace spells for Ace rankers, D-Rank Adapt spells for Adapt rankers, and so on.
Each ranked spell further gets divided into five grades or stars. A five-star spell of a particular rank will have the highest potency and effects than any of its lower-star counterparts within the same rank.
1-star: Initial grade
2-star: Mid grade
3-star: Upper grade
4-star: Peak grade
5-star: Supreme grade
Each ranked spell is only suitable for a mage in that same rank. That means an F-Rank entity in any stage can use the F-Rank spell of any star. But they can not use even the initial-grade spell of E-Rank without facing severe consequences.