CHANCE TO DISBELIEVE ILLUSIONS
This page lists how a creature can see through an illusion and know it for what it is. Chance of success varies much more than the similar 'detection of invisibility' chart, as there are various levels of quality of illusion spells. The likelihood that a creature will see through an illusion varies mostly with intelligence (and note that at super-human levels, creatures can simply be immune to many illusions), how high level the spell is, how cleverly used, and the level of the character; there are a couple of other minor bonuses to the roll to check.
BELIEVABLITY:
ROLL: d20 ILLUSION DESCRIPTION:
25 Believed if: excellent permanent or programmed illusion
24 Believed if: plausible permanent or programmed illusion
23 Believed if: unlikely permanent or programmed illusion
22 Believed if: ridiculous permanent or programmed illusion
21 Believed if: excellent advanced illusion
20 Believed if: plausible advanced illusion
19 Believed if: unlikely advanced illusion
18 Believed if: ridiculous advanced illusion
17 Believed if: excellent spectral force
16 Believed if: plausible spectral force
15 Believed if: unlikely spectral force
14 Believed if: ridiculous spectral force
13 Believed if: excellent improved phantasmal force
12 Believed if: plausible improved phantasmal force
11 Believed if: unlikely improved phantasmal force
10 Believed if: ridiculous improved phantasmal force
9 Believed if: excellent phantasmal force
8 Believed if: plausible phantasmal force
7 Believed if: unlikely phantasmal force
6 Believed if: ridiculous phantasmal force
5-1 Believed no matter what
Excellent – something that perfectly logically is like the illusion appears, where it is, and how it came into sight.
Plausible – something that could reasonably be expected to be like the illusion appears, where it is, and how it came into sight.
Unlikely – something that would be unexpected to be like the to be like the illusion appears, where it is, and how it came into sight.
Ridiculous – something that seems extremely unlikely to be like the illusion appears, where it is, and how it came into sight.
INTELLIGENCE BONUS:
RATING: TYPE: BONUS NOTE
1 Animal intelligence -6
2 Semi-intelligent -4
3 Semi-intelligent -3
4 Semi-intelligent -2
5 Low intelligence -1
6 Low intelligence -1
7 Low intelligence -1
8-10 Average intelligence 0
11-12 Very intelligent 0
13-14 Highly intelligent 0
15 Exceptional intelligence +1
16 Exceptional intelligence +2
17 Genius +3
18 Genius +4
19 Supra-genius +5 immunity to all level 1illusion/phantasms
20 Supra-genius +5 immunity to all level 2 illusion/phantasms
21 Godlike intelligence +6 immunity to all level 3 illusion/phantasms
22 Godlike intelligence +7 immunity to all level 4 illusion/phantasms
23 Godlike intelligence +7 immunity to all level 5 illusion/phantasms
24 Godlike intelligence +8 immunity to all level 6 illusion/phantasms
25 Godlike intelligence +8 immunity to all level 7 illusion/phantasms
Other saving throw bonuses
+1 level 5-8
+2 level 9-12
+3 level 13-16
+4 level 17+
+1 illusionist of any level
+1 barbarian of any level