
SuperParkourio |

I'm reading through a scenario I plan to GM, and I see that the first combat encounter is against a Rolling Incant. It seems to have an ability invalidated by the remaster and another invalidated even before then.
The first is its immunity to evocation magic. It can also replenish HP whenever a non-cantrip evocation spell runs afoul of this immunity. The evocation trait no longer exists, so this immunity does nothing. And seeing has its AC is low and its own spells are fueled by its HP, this monster seems to really need that evocation immunity.
The monster is from Bestiary 3, so it's probably not getting remastered for a while. As GM, I am apparently empowered to address errors that arise due to rules updates, but I'm not sure how to address this. Replacing references to "evocation" with "spell damage" might make the monster too tough, but ignoring the immunity entirely might make it too easy.
The second issue is with its Engulf ability, which allows it to Stride twice and try to gobble up anything in its path. This monster has no land Speed to Stride with, and unlike a fighter's Sudden Charge, the Strides can't be replaced with Fly. I guess I could just allow it to use its fly Speed instead, so this issue isn't as bad.

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Firstly - I would treat any spells that were evocation spells before the remaster, as if they still had the evocation tag for this monster. I would also count any spells that are 'spiritual successors' to old spells like if they had the evocation tag (force barrage being the new magic missile, which used to be evocation, as an example).
If it got hit by remaster spell that very strongly feels like it would be evocation spell (like, say, some sort of "lightning strikes from the sky!") I might also count that as an evocation spell... But this would be more context sensitive decision and I'd be tempted to rule in a player's favor.
Secondly, yeah, not being able to use it's engulf, which it clearly is supposed to be able to use, would be 'too bad to be true'. It has only one movement speed so that's the one I would use for it when using engulf.
If it has like, "speed 10ft, fly 40ft" then this question would be more complicated, because one could argue that it's intended as a balancing factor that it can only move 20ft if it wants to use engulf and not 80ft and we don't actually know what the devs were thinking - but now that it only has one speed, it's clear that's what it's supposed to be using.

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Maybe I'm just thick, but I don't see why Engulf wouldn't work with a Fly speed?
Engulf says:
The monster Strides up to double its Speed and can move through the spaces of any creatures in its path.
Stride simply says:
You move up to your Speed.
And Speed says:
Most characters and monsters have a Speed statistic that indicates how quickly they can move across the ground. This statistic is referred to as land Speed when it's necessary to differentiate it from special Speeds.
When you use the Stride action, you move a number of feet equal to your Speed. Numerous other abilities also allow you to move, from Crawling to Leaping, and most of them are based on your Speed in some way. Whenever a rule mentions your Speed without specifying a type, it's referring to your land Speed.
Bolded part indicates why it wouldn't work on a Fly speed, but since the Incant doesn't have any other speed, it seems obvious to me that it would apply to the Fly speed. If it had both a land speed AND a fly speed, yeah, it should only apply to its land speed, but since there simply isn't one, the intended use is clear. Yeah, there's a hoop to jump through to jump to that conclusion, but not a far-fetched one. Since its Engulf ability is also referenced in its flavour text, I doubt it's put there by accident.

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I mean, technically you're right, but if there's one interpretation that's clearly wrong (a creature that only has a Fly speed and an ability that specifies a Stride action can't use that action to Fly), and an interpretation that makes sense (a creature can use its Fly speed to Stride), it's easy to know which one to pick.

SuperParkourio |

Except neither interpretation makes sense. You can't Stride with a fly Speed, which is why abilities mentioning Stride either allow you to replace it with Fly (Sudden Charge) or deliberately do not (Haste). The game intentionally leaves a lot of movement mechanics solely under the usage of land Speed so that creatures with alternative Speeds don't have too much of an edge.