Archipelago/worlds/terraria/docs/en_Terraria.md

Terraria

Where is the options page?

The player options page for this game contains all the options you need to configure and export a config file.

What does randomization do to this game?

Boss/event flags are randomized. So, defeating Empress of Light could give you Post-Skeletron, which allows you to enter the Dungeon, for example. In your player options, you may also add item rewards and achievements to the pool.

What Terraria items can appear in other players' worlds?

Boss/event flags, and item rewards if enabled.

What does another world's item look like in Terraria?

You won't see the items in Terraria, but you will receive a chat message, telling you what item you sent to whom.