Sparkworks

Most parts cost a little metal, stone or wood, and the ones with a light or a mechanism add an Archaic Essence of any grade. The Spawner and the Sparkworks Trigger Zone are never crafted: you pick them from the Sparkworks Tool's own menu of objects and place them directly, and like everything placed that way they are only visible while you hold the tool. The Sparkworks Switchbox opens a graph wherever it stands. Removing a Switchbox does not delete its graph, which you can still open with the Sparkworks Tool from anywhere in your base.

Each logic type sends a signal, takes one, or both. Levers, buttons, the Pressure Plate and the Trigger Zone only send, traps, trapdoors, the Goalpost and sounds only take, and lights, doors, water dispensers, drains and the Spawner do both. A Push Button sends a short ON and switches off again, a lever or Switch Button holds its state until it is used again, a Pressure Plate stays on while something stands on it, and a Shootable Button flips each time an arrow or spell hits it.

The Switchbox opens the graph editor, where wired parts meet these logic nodes. AND, OR, NOT, XOR and NAND combine signals, so a door can open only while a lever is up and a pressure plate is held. Toggle, Delay, Hold and Flank shape a signal over time, and the Clock fires on a timer of its own; it is the one node the game gives no tooltip. Save Signal and Use Signal carry a signal elsewhere by matching Channel, and Output lets a whole graph feed into other graphs.

A Trigger Zone's filter decides what sets it off: anything, players only, enemies only (Fell, Vukah, Scavengers, wild beasts, Hollow, Cyclopes, Drak'Dal and Ancients), or wildlife and farm animals only.

The Spawner makes a creature when it gets a signal, picked from groups that unlock as you play. Five are there from the start: the Scavenger Scab, Fell Squire, Fell Critter Hatchling, Wolf and Rat. Every other group unlocks when you reach the top of an Ancient Spire, or once anyone has opened that spire for fast travel in the world, and it is usually the next region's spire: Springlands Enemies II waits for the Revelwood spire and Albaneve Summits Enemies for the Veilwater Basin one. The Veilwater Basin group unlocks at Cinder's Ascent and the Cinder's Cradle constructs after Vorgoth falls. The bosses are not on the list: the Hollow Cyclops, both Fell Thunderbrutes, the Fell Monstrosity and the Ancient S.P.D.R. Construct sit in an unnamed group that the game files give no unlock.

All 62 open and close on a signal, from the Crude Wooden Door to the Huge Ancient Door, the Carved Secret Bookshelf Door and both irrigation gates.

Any light source works, as the Light's own description says, so candles, braziers, chandeliers, lanterns and torches all switch on and off with a signal.

The rockets, confetti mortars and fountains take a signal the way a trapdoor does, so a lever or a Trigger Zone can set them off.

Dispensers pour water until they are submerged and drains remove the water above them. Both take and send signals, so one switch can flood a room and empty it again.