1.
Use-activated items typically don’t have any activation
times (because they function continually or because you
activate them automatically as part of the action you take to use
the item). Like command word items, use-activated items
usually don’t duplicate spells with long casting times.
Activating a scroll (or any other spell completion item) is “like
casting a spell for purposes of arcane spell failure (such as from
armor)” (see “Activation” on page 238 of the Dungeon
Master’s Guide). An armored rogue who activates a scroll with
Use Magic Device suffers the normal arcane spell failure
chance.
FAQ
2.
Any creature covered by the dust takes a –40 penalty on Hide checks.
SRD
5.
Does a rogue apply sneak attack damage when
throwing alchemist fire or casting a spell such as acid
splash?
Yes. The bonus damage from sneak attack, skirmish, or
sudden strike applies to any attack that requires an attack roll,
even touch attacks.
FAQ, 用弱线SA出来的伤害是负能量伤害.
