I came across a crimson altar in Terraria, and have spent 26 minutes looking this up with no results: how, in the world, do I use it? I seriously do not understand. And this has been a common theme with this game from the get-go, like the Extractinator with its bizarre place the silt into the machine like you're placing a block interface. It's occurring to me that Terraria is very unintuitive and kind of all over the place with its user interface.

The wiki says the suspicious-looking eye can be crafted with it, but despite all my frantic clicking, I can't get the thing to work. I've tried standing on it, hitting it, clicking every button on the mouse, and throwing the whole stack of lenses on top of the altar with no results.

I hope this doesn't have to do with expert/normal mode. Cause if so, well, why did it even spawn, first of all, but if so, then I wasted an hour beating a dead horse.

To say this is frustrating would be an understatement.


The crimson/demon altar is a crafting station. You can use it to create early-game boss summoning items and the Night's Edge.

You use it like any other crafting station - simply stand next to it, open your inventory and click whatever item you need to craft.

|improve this answer|||||
  • 2
    Well, now I feel silly. – Braden Best Apr 24 '16 at 4:54
  • @BradenBest Don't worry, they are a bit weird. Remember, they can't be moved - you will need to go to it if you want to use it. – angussidney Apr 24 '16 at 4:55

It is simply a crafting station like any other in the game (work bench, anvil, etc.). To use it you just stand near it and open your crafting menu and you'll see the new options available pertaining to the demon altar.

If you don't see any new crafting options available in your crafting menu make sure you're standing close enough to it.

And don't feel dumb, the same thing happened to me the first time I found one!

|improve this answer|||||

The demon altar is what I have in my world and these are a few crafting recipes for it

Suspicious looking eye(summons the eye of Cthulhu) - 6 lens

Lens can be found after killing demon eyes during night.

King slime thing(I forgot the name but it summons king slime) - 99slime and a gold crown I hear platinum crown works to but I used a gold one

|improve this answer|||||
  • 1
    you should read the posting guidelines on the main site, stackoverflow (and maybe read some meta posts about answers vs comments) about answering questions, and while you're at it, read the terraria wiki to fact check your answer (which, by the way, doesn't answer the question), cause it's 20 slime balls, and possibly a different amount for console and mobile, but it certainly is not 99. It's also not very helpful what you did. You listed two recipes, describing how to get one but not the other, in a disorganized fashion, when that's something that's beside the point and should be linked. – Braden Best Apr 30 '16 at 21:29
  • 1
    Continuing, since i mentioned links, I'll also tell you that you should be careful with them. For example, do not answer a question with only a link, because links tend to rot. If your answer depends on a link, then you should copy and paste the relevant text to provide a full answer. If you address these problems with your writing, I'm sure your future answers will be more positively received. – Braden Best Apr 30 '16 at 21:30

Go near the thing just like a crafting bench and press Esc then go on craft something all tho it can also be used to craft summoning items such as king slime or suspichious looking eye.

|improve this answer|||||

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.