"Let me guess, your home"

"It was... And it was beautiful"

"Similarly, you can alter the appearance of structures, or add them where none are present."

As a generic example, would a giant statue of a hand (maybe made from bricks) count as a structure?

Does Malleable Illusions animate the change of Illusions, or just switch over? For example, using the tactile nature of MA, slide buildings into each other, toppling a building over, or animating aforementioned statue to grab, punch or slam into enemies?

Well, for the animating of the statue, you can't make creatures in the area. but if you did have malleable illusions it would let you open a canyon under the enemy army and once they have fallen you could fill up the canyon, therefor suffocating them. If your DM was very lenient with you, then you could turn the dungeon you are going into into a mountain, therefore killing an entire dungeon in 10 minutes. If you used wish so you could cast this in the middle of battle then it would be devastating.

Couldn't you just make a giant adamantine fortress with this? it says you can make buildings and it lasts for 10 days.

A fortress is expressly built to conceal creatures, so no

It means conceal as in turn invisible. A forest would conceal creatures but you could still make one.

I have a weird thought. Let’s say that there is a wizard school of illusion (level 14) and he casts Mirage Arcane targeting a town. He keeps everything the exact same, just like it was before the spell was cast. With Malleable Illusions and Illusory Reality combined, could the wizard walk up to a store and make a hole in the wall(Malleable Illusions allowing him to do this) then make it real with Illusory Reality. Could he go through the hole and be in the actual store?? For infiltration purposes??

If anyone could help my curiosity that would be great :)

This is a really cool idea but I am not one in a position to tell you the answer.

I would say its up to your DM.

But I love the idea.

This spell can create terrain, but can it destroy it?

HOLD UP I HAD AN IDEA

So say that you make a legendary magic item appear in the illusionary terrain. Would it still have magical properties as long as it stayed within the area of the spell and the spell lasts, or would it not work and the legendary item just looks like the real thing?

Thats a really good idea! In my opinion, and I'm no DM this is just my own opinion, I would say that if you were a Wizard school of Illusion and had Illusory Reality, you would need to have had an experience with the legendary item like attuning to it and understanding it properties to make an illusion of it then make it real with Illusory Reality. I also feel like the DM would just say "You make it real and its the legendary staff, but when you go to use the spell that you know it casts, nothing happens" because its an illusion and is meant to look like the legendary item not gain its properties. But it ultimately depends on how nice your DM is XD 

This is a SUPER sick idea and I don't want my opinion ruin your idea. 

The spell says that you make a certain terrain feel and smell like some other type of terrain, but I don't think that you could actually destroy anything there because the spell is simply an illusion.

Yeah that what I thought, but I was confused because someone said that they can create a chasm so I didn't know what to think.

I have another weird thought. Can this spell kill somebody?? Like if you cast this spell and make a hole 200 feet deep right underneath some guards guarding a door, can you use Illusory Reality to make it real and kill them??

Idk but I assume creating a huge slab of stone above their head using this spell would kill them.

This is a weird illusion spell cause it kinda creates things since they can be touched.

ALSO... could I make a ballista? Or maybe like a hill to get the high ground in a battle?

or maybe use it like bones of earth?

Does a bridge count as a structure?

and if I built a huge wall between me and maybe an army, how big could it be?

Quick question:

I if used Mirage Arcane to create a forest, could I hypothetically cast Awaken on a tree and have an illusory/real awakened tree?

"Depends on your DM": the spell.

But remember this spell only adds onto existing terrain. You can change what it looks like or appears to be made of, but the previous terrain is still there. You can make a tree look like a dead tree, or a different tree, or turn it into adamantite, but you can't remove terrain.

Some examples:

• You alter a house to have a hole in the wall. That hole is full of the non-altered wall, as it is only a hole in the illusion. The original terrain is still there. Likewise, adding a window would just fill the window with the unaltered wall. The old terrain is still there, you are just covering it.
• You turn an open field into a swamp. That swamp is no deeper that the old field, as that becomes the bottom of the swamp.
• You make an adamantine wall around a town. Wherever the wall would conceal anyone, when you cast the spell, is now a hole. The spell does not conceal creatures.
• You try to turn a house into glowing hot lava/metal. This fails where the change would conceal a creature, so any surface that would conceal a creature remains unchanged. Everything might still catch fire though, because most of the floors are now made of glowing hot lava/metal.
• Your turn a road into a river. The bottom of the river is the road, you've just added a river on top. Thus the river is only as deep as you raise the surrounding terrain.
• You turn a river of lava into ice. The ice is cold, you can walk on it, but there's still lava underneath it. Make a hole in the ice and things get hot again.
• You make a tree. The tree can be up to 1 mile high and made of whatever you want (like adamantite, gummy bears, or paper). You cannot awaken this tree if you make it more than huge in size. If it is huge it can be awakened, but will disappear at the end of the Mirage Arcane duration.
• You turn a snowy valley into a green valley in full bloom. This is added on top of the snow, it does not replace the snow, and the air is still cold.
• You make an illusory bridge over a chasm. The bridge remains in place for 10 days, unless destroyed, so make it out of something very durable.
• You are at the top of a mountain. It is a mile long drop to the ground bellow. You can turn it into a mile long slope instead, and ride a shield down said slope for fun. Or add stairs, if you're going up or want to walk down.
• You turn a dune filled desert into a nice tempered forest around a lake. That lake is no deeper than the dunes allow for and the climate remains unchanged. You can swim in the lake, you can drown in the lake. Beneath the lake is still the desert dunes.
• You make an illusory rock and throw it at someone. It acts like any rock. If a creature has truesight it will see that it is an illusory rock, but it is still solid and will act like a solid rock. They just know it's an illusion and can see through it, but it still hits them like a solid rock and acts, feels, smells and tastes like a solid (though transparent) rock.

Final thoughts

I'd consider trying to turn a whole city into lava/glowing hot metal and watch everyone burn... if I was evil. Good thing I'm totally not. Go team! Or make a 1 mile high adamantine tower to live in, with a lava moat. Or taunt my enemies by making a giant dick rise on the horizon. The sun behind it, so our enemies knows we'll fight them in the shade... of the peen. But that's just me. You do you.

For damage I'd use no more than the recomended 12d6, from the "Create a Spell"-section of the Dungeon Master's Guide, for stuff like hazards created by this spell, such as lava, hot metal, or an acid lake to name some hazards.

This is spell really depends a lot on your DM, so discuss its use with them before you pick it and see how they are okay with running it. Otherwise you risk turning a whole session into nothing but a long discussion on the rules. That is much better to have before or after the game, if you can, so you don't stop the game for everyone who didn't come for a long rules discussion. I hope this was of use to someone. :)

I don't think so, because the trees aren't real. You could probably use another illusion spell to make it look like you're casting spells on the illusory trees.