Thanks for the reference rdanhenry.
A-4.18 Spells Skill Categories
Pg 126 RMFRP is almost word for word;
Spell Casting Static Maneuver Roll =
1d100 (open-ended)
+ caster's skill bonus for the spell's list
+ mods from Spell Casting Modifications Table T-4.6
The +50 was added to the chart for RMFRP, but is essentially the same.
Noticeably absent is a mention of the General Modifiers listed on p. 140. This is case against using them.As with all things RM, there's room for argument. Have fun with the version you use.
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Back to Shield Spells,
The Arcane spell Shielding from the Arcane Shield List is odd.
1. Shielding--- ....word for word Shield spell except Duration is "C".
Then at 3rd lvl, the standard Shield spell with 1 min/lvl Duration.
If you can get Shield effects, (functions as a normal shield...-25...no hand.. can't use "real" shield) and be required to Concentrate (50%Act), then it probably does not require %Act to actually use the shield created from the spell. Also, you probably can't use it to attack/bash because that would require %Act...