
Midgefly |
For the spell Strange Geometry
Do creatures need to make additional will saves each time they re-enter a cube even if they succeeded at their save before? Or do they simply now disbelieve every cube casted by this spell going forward? Additionally, if they fail, do they now count as failing for any additional cubes they enter or do they roll their save again if they-re-enter? (This is without spending an action to interact for disbelieving)

painted_green |

The way I would run it is to treat all cubes as a single illusion, so if you disbelieve it once, you disbelieve all of it, but if you fail to disbelieve, you do not get another free attempt. You would still be able to get another save to disbelieve by interacting with the illusion, but that requires an action and is not automatic.
This is just my interpretation though. What is RAW/RAI here is probably just unclear.

painted_green |

The most closely analogous spell (at least the way I see it) is Hallucinatory Terrain, but unfortunately that spell is similarly unclear to me. It says you get an attempt to disbelieve when you touch it, but doesn't specify how repeatable that is. I would only allow one attempt for that spell also, and from then on other attempts would require to specifically Seek trying to suss out an illusion. Certainly moving inside the illusion should not prompt new saves since that would make the spell too weak. However, I also feel that entering the area, though a common trigger for other spells, shouldn't really enter into the equation for 'terrain illusions'. In my mind, the 'embedding' into the rest of the world is part of the illusion.

Errenor |
The most closely analogous spell (at least the way I see it) is Hallucinatory Terrain, but unfortunately that spell is similarly unclear to me. It says you get an attempt to disbelieve when you touch it, but doesn't specify how repeatable that is. I would only allow one attempt for that spell also, and from then on other attempts would require to specifically Seek trying to suss out an illusion. Certainly moving inside the illusion should not prompt new saves since that would make the spell too weak.
Yes, I agree. Though they are not very alike (one is a small obviously unusual and disconcerting area(s) and another is huge and most of the time looks like something normal, they also have different aims). So we have a reason to judge differently, and GMs have some leeway with illusions. Hallucinatory Terrain is a 'masking' illusion and they most often give another disbelieve attempts when there's some mismatch with reality for a character. So, no free attempts every action, but even zero-action cost attempts are allowed when something is obviously wrong when interacting with it (for example you've fallen through it). Strange Geometry is very special, obviously strange thing with special rules and I think that following this very literally just works: 'A creature must attempt a Will save [every time] if ... it later enters one of the areas, with the following effects...'.