The 3e answer was that you take the lowest mana zone between subject and caster. 4e Magic didn't change much.
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Originally Posted by Roleplayer 20
A missile spell would continue across the boundary into a no-mana zone. No other spell or spell effect would cross into a no-mana zone.
When a spell is cast between different zones, both of which contain mana, calculate penalties as for the lower of the two zones. Thus, if either the caster or the subject is in a low-mana zone, the roll will be at -5. In the case of a spell like Great Voice, in which the "target" of the spell is the speaker, the location of the listener(s) doesn't affect the spell, as long as they are not in a no-mana zone.
A caster in a zone of very high mana has the benefit of fatigue-free casting (if he's a mage) and the problem that any failure will be very dangerous, regardless of where his subject is standing.
http://www.sjgames.com/gurps/Rolepla...#anchor1158242 |
Note that you can choose a non-straight-line path for your spell to take (
Word of Kromm), assuming you're willing to soak the additional range penalties. Spells don't have to follow minimum-distance straight lines. This is perhaps most important when someone wants to hide behind a small no-mana zone. They're not completely safe unless they're completely surrounded.