Talk:Robin Hood/@comment-201.146.105.159-20180302073247/@comment-4802891-20180302075452

For NP, rank is about the destructive power of the skill, taking in account type, range and number of targets.

Something like Excalibur is A because it's a potent Anti-Fortress attack, and it has the + modifier because it can exceed it's own row power by accumulating mana. The excess isn't lost (the Overcharge) and Artoria can potentially spam this. Very potent NP.

NPs with strong Anti-Unit power are usually B, because they can't decimate an army in one go. NPs with no offensive power are trickier to explain (like Mash's B+++ defensive skill), but for the general kind, that's pretty much how it is...

As for Robin's NP: In itself, it's nothing but a very weak projectile. He can't make it stronger, and it has no particular advantage. However, its true power is unleashed if the enemy is already poisoned. Because of those limitations, the rank is low.