Tactics for playing as the Sylvan faction.

I think "cast" refers to "Rain of Arrows":
Archer's Dream.
Ranger: additional bonuses
» If there are 2 items: After shooting, the ranger
moves back 30% less on the ATB scale
than usual.
The effect also applies to the skills
"Deadly Shot" and "Rain of Arrows".

That's correct.
Spellcasting works only with single casts, just like spell luck. That is, when using Rain of Arrows, neither spellcasting nor spell luck will work (and the extra skills are unnecessary). That's what I was trying to say.
2 Boris K. Where did you get 28 native spells and 42 attack? And besides, a campaign isn't serious. By the way, if you have a replay of the battle, please share it.