i've just see there were the same kind of discussion in "Can Elemental Bolts be parried?"
The day i will use RMC (i use HARP now) i will do as i do in HARP, whatever the official version (you ICE staff are too funny
) is =>
- any missile (physical, energical, magical, breath, ...) can be
blocked by a shield (the DB of the shield.)
- parrying is not blocking.
- no weapon can be used to parry a missile (no exception)
- Full Shield Block = 100% action, double DB value of the shield. No OB to DB, no parry, no no-weapon stat bonus, no prof/level bonus, just pure clear and nice passive DB (+Qu bonus).
That's simple and keep my sanity.