Living Tree

Living Trees look like ordinary forest trees drawn much larger, but they are made of solid blocks rather than background scenery, so you cannot walk through one and an axe applied to the trunk does nothing useful. Getting in means mining. Inside is a shaft running down into the ground, and somewhere off it a treasure room with themed furniture and a Living Wood Chest.

They generate in clusters. One main tree carries the treasure room and up to three more on each side connect to it through horizontal tunnels, which sometimes hold chests of their own. Only the main tree has the room, so a group of seven trees still has one prize between them. Follow tunnels that head downward; the ones running sideways are going to a neighbor.

The internal shaft is sealed, so you have to break into it. Cutting in near the top of the trunk and dropping is usually faster than tunneling through the roots, and it means gravity does the work on the way down.

The living wood walls that generate with the tree do not count as safe walls, so the rooms inside are not valid NPC housing as they stand. Place your own wall over the natural one if you want to move somebody in.

The Finch Staff is the reason to open one early. It is a summon weapon obtainable before you have fought anything at all, which for a summoner run makes it a starting weapon rather than a curiosity. The Living Wood Wand and Leaf Wand also come out of these trees. They are building tools rather than weapons, and they let you grow trunk and canopy shapes anywhere you like, which is most of what people end up using living wood for.

Gnomes spawn inside Living Trees more readily than anywhere else. They are not much of a fight and that is not the point. Expose one to direct sunlight and it turns to stone, leaving behind a Garden Gnome, a piece of furniture that raises your luck while you are near it. Luck quietly moves drop rates and crate contents, so digging a shaft from the surface down into the tunnel, letting the light in and waiting is time well spent if you are heading into a long farming session afterward.

Small worlds get up to two groups, medium three, large four, and a group is one main tree plus up to six around it. Secret seeds push that hard: a Remix world can stack seventeen trees into one group and a Zenith world fifteen.

Placement rules keep them away from a few things. Oceans are excluded outright, and the game rejects any candidate spot with cloud, rain cloud or dungeon brick within fifty tiles in any direction, which is why you never find a Living Tree directly beneath a Floating Island or beside the Dungeon. On small worlds a tree can grow tall enough to reach Space.

Two oddities are worth knowing. In drunk worlds you get a Living Tree where the Dungeon entrance should be, and its tunnel drops you at the Old Man instead. And a tree's internal shaft is occasionally overwritten entirely by an Enchanted Sword Shrine, which is a considerably better outcome than the chest.

A Living Tree is a wall. Corruption, Crimson and Hallow spread through connected blocks in Hardmode, and a solid column of living wood with the ground cleared underneath it stops that spread dead. Trees near your base are worth keeping intact rather than harvesting for materials.

They are also the tallest thing on the surface in most worlds, which makes the canopy useful ground against The Destroyer. Fighting a burrowing worm from a platform it has to climb to reach you is a real advantage, and the branches give you somewhere to stand while it does. The wood and leaf blocks themselves feed a full furniture set through the Living Loom.