If an effect is Illusionary, then its presence is merely a trick of the mind and it's not really there. Illusions can have different levels of strength.
- Minor Illusion
- A Minor Illusion is a purely sensory experience that can be seen, heard, or felt. It can not, however, be physically touched or interacted with. A Minor Illusion can be detected with Detect Illusion or disbelieved with Disbelieve (DC 6 INT feat save). If disbelieved, the creature disbelieving can choose to no longer perceive the illusion.
- Full Illusion
- A Full Illusion can be touched and interacted with, but it is still not real. Nevertheless, Full Illusions can be quite dangerous if they are not recognized as such and can still cause physical harm. A Full Illusion can be detected with Detect Illusion or disbelieved with Disbelieve (DC 12 INT feat save). If disbelieved, the creature still perceives the illusion, but is no longer affected by it.
- Greater Illusion
- A Greater Illusion is a powerful effect that can be touched and interacted with and that is very hard to overcome. A Greater Illusion can be detected with Detect Illusion or disbelieved with Disbelieve (DC 18 INT feat save). If disbelieved, the creature disbelieving it has only 5 seconds of respit where they are not affected by the illusion. After that, the illusion is back to full strength.
The GM may choose to change the DC of the Disbelieve check based on the complexity or power of the illusion.