Illusory Reality being the lvl 14 Illusion Wizards' subclass feat. Let's say someone created an adamantine cage, and the occupant tries to break their way out. Can they? And if so, how do you decide on the AC and HP of the object?
Yes, they would be exactly as breakable as a non-illusory object would be... for one minute, and then they'd cease to be real, broken or not. The AC and HP would be the same as you'd set for an actual object of that type.
I would say it has the same health and AC as a typical object would if it already existed, meaning an illusion made into a chair would act like a regular chair in terms of health. This is really vague and not expanded upon in the books, so it varies from people to people.
Per the ‘14 DMG, and the ‘24 DM screen, adamantine has a 23 AC. As a large object, it would have 5d10 (27) hp. But nothing about hardness/ damage threshold. I could swear I saw a chart of it somewhere, but I can’t find it.
It could be that those are really only meant to be used for things like buildings and wouldn’t apply here.
Per the ‘14 DMG, and the ‘24 DM screen, adamantine has a 23 AC. As a large object, it would have 5d10 (27) hp. But nothing about hardness/ damage threshold. I could swear I saw a chart of it somewhere, but I can’t find it.
It could be that those are really only meant to be used for things like buildings and wouldn’t apply here.
Yeah, that 23 AC is also found in the Rules Glossary (Object Armor Class)
Damage threshold in 5e is more to keep trash mobs or low tier PCs from breaking something just because they spend a lot of time hitting it. I wouldn't worry about it for a scenario where the object only lasts 1 minute and the PCs are already high tier 3 or tier 4. If you want to add some sturdiness, toss in resistance to most damages.
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Illusory Reality being the lvl 14 Illusion Wizards' subclass feat.
Let's say someone created an adamantine cage, and the occupant tries to break their way out.
Can they? And if so, how do you decide on the AC and HP of the object?
A DM can use rules for Breaking Objects you can make real with Illusion Reality .
Yes, they would be exactly as breakable as a non-illusory object would be... for one minute, and then they'd cease to be real, broken or not. The AC and HP would be the same as you'd set for an actual object of that type.
I would say it has the same health and AC as a typical object would if it already existed, meaning an illusion made into a chair would act like a regular chair in terms of health. This is really vague and not expanded upon in the books, so it varies from people to people.
Are there any guidelines on how to decide the damage threshold? I'd assume an adamantine cage would have one...
No guidelines per se, one of the example provided is that
For adamantine, going with my gut, I'd personally rule it has a damage threshold no lower than 15, but no higher than 20.
Per the ‘14 DMG, and the ‘24 DM screen, adamantine has a 23 AC. As a large object, it would have 5d10 (27) hp. But nothing about hardness/ damage threshold. I could swear I saw a chart of it somewhere, but I can’t find it.
It could be that those are really only meant to be used for things like buildings and wouldn’t apply here.
Yeah, that 23 AC is also found in the Rules Glossary (Object Armor Class)
Damage Threshold is used for Airborne and Waterborne Vehicles as well.
Damage threshold in 5e is more to keep trash mobs or low tier PCs from breaking something just because they spend a lot of time hitting it. I wouldn't worry about it for a scenario where the object only lasts 1 minute and the PCs are already high tier 3 or tier 4. If you want to add some sturdiness, toss in resistance to most damages.