What a transformation is
A transformation triggers when you collect a set of related items. Reach the set size and a bonus turns on.
The bonus is usually strong. It can add flight, extra attacks, or a whole new effect.
Sets count specific items
Each transformation has its own list of items. Only those items count toward the set.
The items still work on their own. You gain the set bonus on top, not instead.
Guppy and the famous flight
The Guppy set is the best known. Collect the needed pieces and you gain flight and a swarm of flies.
That swarm turns your hits into small damage dealers. Flight also opens routes a ground-bound run cannot take.
Partial sets and planning
A set you almost finish still helps. The pieces you took are useful even without the bonus.
Track your set as you pick items. Knowing how far you are guides the next pedestal choice.
Next: Item synergies basics and Trinkets and consumables.