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Message: <blockquote data-quote="Lanefan" data-source="post: 9034378" data-attributes="member: 29398">And in saying that spell X can do Y but not Z there IMO also needs to be a why in there somewhere.  Put another way, if the rules don't need to say how the magic works then I-as-DM am left to make it up for myself; and having at least a vague idea of what the designers had in mind would make that process much easier (and if the designers didn't have anything in mind that's an unrecoverable fail on their part).It's trivially easy to lay down a few basic principles:--- if a spell causes anything physical - a bead, an arrow, etc. - to go from caster to target(1) then any physical obstacle will block it--- if a spell does not cause anything physical to travel from caster to target(1) but requires a visible target, then transparent physical obstacles do not hinder that spell, nor do they hinder visible spell effects e.g. rays, dancing lights, etc. from functioning as intended--- if a spell neither requires a visible target nor causes anything physical or visible to travel from caster to target then it can be cast anywhere within the caster's range without regard for obstacles of any kind(2)--- a roll for aiming is always required when caster cannot see the target point, person(s), place, or area.1 - or from somewhere else to target e.g. Call Lightning causes lightning to travel from the sky to the target2 - excepting obstacles that block all magic e.g. a lead-lined wall; and this is specifically intended to allow blind-casting into previously-unseen areasYes; and though I've never 100% bought into Weave theory myself I appreciate it as at least being a halfway-thought-out attempt at explaining how and why magic works the way it does.</blockquote>

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