03-13-2018, 04:27 PM | #1 |
Join Date: May 2008
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Illusions
Is there some sort of contested roll for an intelligent creature (IQ 10 Werewolf for example) to figure out that the illusory wall of whirling blades (for example) are in fact illusory instead of some sort of advanced conjuration?
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Running 3 GURPS games: DFRPG, Supers and a weird Evil Hogwart's (ish) game. Check out my blog: Dungeons on Automatic |
03-13-2018, 08:26 PM | #2 |
Join Date: Sep 2004
Location: Montréal, Québec
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Re: Illusions
Considering that Know Illusion is a regular spell one would cast at the blades, there probably isn’t a simple “disbelieve” saving throw.
However, I’d certainly let someone roll Hearing to realize a simple illusion lacks sound, or Navigation to figure out the mechanism couldn’t possibly be in that wall because we’ve just been around the other side, and so on. This will give suspicion, enough to justify casting Know Illusion (or throwing a rock at it, really), but not make it go away.
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Per-based Stealth isn’t remotely as awkward as DX-based Observation. |
03-14-2018, 12:39 AM | #3 |
Join Date: Aug 2004
Location: Phoenix, Arizona, USA, Earth, Sol, Milky Way, Infinity.
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Re: Illusions
Quoting the Spells book, description under Simple Illusion...
Any IQ 6+ being can dispel a Simple Illusion by “disbelieving”: taking a Concentrate maneuver and making a successful Will roll. |
03-14-2018, 05:05 AM | #4 |
Join Date: May 2008
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Re: Illusions
Sure, the issue I see is that they have to know to make the roll.
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Running 3 GURPS games: DFRPG, Supers and a weird Evil Hogwart's (ish) game. Check out my blog: Dungeons on Automatic |
03-14-2018, 06:44 AM | #5 |
Join Date: Apr 2007
Location: Ottawa, ON, CA
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Re: Illusions
DFRPG Spells doesn't offer this, but my standard method is to roll a Quick Contest of IQ (not spell skill!) against the Per of anyone in a position to notice (save time and roll once for a group of foes with the same Per). If you win, the illusion fools that individual - and you make a fresh roll any time they interact with it. Roll a new contest each time someone you've already fooled changes how they're interacting with the illusion.
(The well-read will notice I cribbed this from GURPS Powers p.94, which does a much better job of outlining 'how to interact with illusions'.)
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M2: Everything is true. GP: Even false things? M2: Even false things are true. GP: How can that be? M2: I don't know man, I didn't do it. |
03-14-2018, 07:09 AM | #6 |
Join Date: Feb 2009
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Re: Illusions
I'd allow a Thaumatology or Occultism check
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