[quote=@vancexentan]
Benkei isn't allowed be side his phantasm steals phatasms gg lancer you have no lance and no luck to fight it.
[/quote]

I understood it as sealing all NP's, i.e. turning the fight into a purely physical one. Same as what Achilles spear does in Apocrypha.

I won't fight that decision though, it's up to you ultimately.

[quote=@vancexentan]
Alchemy is judged on a case by case basis and is limited by how much stuff you carry and can be based on that also rin and kayneth  are high tier mages run gas all affinities and kayneth has years of training. 
[/quote]

Kayneth and Rin are geniuses, but that's beside my point. Most Magus we see don't really use a standard set of spells, which is what your system seems to imply.