@paillp Veloren is much more of an adventure RPG (likd BotW) than a building sandbox (like Minecraft). Here is the answer from our FAQ:
There is some destruction - you can mine ore chunks and certain kinds of rock with a pickaxe.
Building isn't intended to be a major part of the game though and is currently only available for server admins and in singleplayer mode through commands. You can read more about it here: https://book.veloren.net/players/building.html
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