outlier said:
A couple of questions, if anybody could spare a moment: Our group is playing 3.5, but is fairly new to it.
If I understand this, we now have free (f), swift/immediate actions (s), move actions (M), standard actions (A), and full round actions (F), where the time required appears to be F > A > M > S > f.
1. Core rules (at least my copy of PHB, DMG, etc) don't mention swift actions. Are swift actions considered core?
2. As I read them, the core rules say that in a round there's enough time to combine either F, A+M, or M+M in one round, plus some f's if you like. Adding swift actions appears to let you take F+s, A+M+s, M+M+s. But if a swift action is just something that's quicker than a move action, you'd be able to take M+s+s or s+s+s. This thread implies you can't, but why not?
Immediate actions were added to the Core with the Expanded Psionics Handbook. They have been added to the SRD, for publishers to use in their own support products. Swift actions were first seen in the Miniatures Handbook, principally as the casting time for a new series of very short duration spells that simulate opportunity-based activity ... for example, Swift Invisibility allows you to go invisible as a Swift action, then take your normal Full round or Standard + Move action sequence. Whether you attack or not, though, the Swift Invisibility only lasts that round, and you are visible again at your next action. Swift actions have also been added to the SRD, and just about all WotC books in the last 6 months have had sidebars describing them (because they were added after the Core books were published). Both are considered variants on free actions, but take a little longer, so you are limited to 1 of either in your turn. Immediate actions are ones you can take during someone else's turn, but that uses up your NEXT turn's Swift/Immediate action. Featherfall, now, would be considered an Immediate action to cast, for example.
Part of the debate here is whether a double-move is 2 Move actions, or 1 Standard action used to move + 1 Move action used to move.
If the "2 Move actions" interpretation is correct, then there is an implied "trade down" of a Standard action for a Move action, and it might be extended to say that you can cast a spell with a casting time of 1 Swift action or 1 Immediate action on a Standard action in addition to having cast such a spell as your Swift/Immediate action for the turn.
If the "1 Standard action used to move + 1 Move action used to move" interpretation is correct, then there is no such "trade down", and the prohibition of "only 1 per round" says you can't trade the spells down.
As to my personal take, I tend to go with the "trade down" approach, and that it would be Ok to use your Standard action to cast a second Swift spell. This is because they mostly have short durations and help set up a more favorable situation for combat (as the Swift Invisibility mentioned above). If a creature uses its Standard action, not to act on the advantage it has but to try to increase that advantage, I think the return on the investment is small enough not to worry too much about it. Of course, depending on the inventive spell combinations, I may have to revise that opinion at some point.