When you choose this archetype at 3rd level, you must choose an element: fire, air, water, or earth. From that point on, you are a firelacer, airlacer, waterlacer, earthlacer. You can't choose another element, even if you later get to choose again.
Basic Lacing
You gain your element's Basic Lacing abilities (Firelacing, Airlacing, Waterlacing, Earthlacing).
Elemental Dig
When a creature is hit with a weapon attack within 30 feet of you, you can use your reaction to fire a bolt of elemental power at the target, in addition to the weapon's damage. The extra damage is 1d4 bludgeoning damage. This dig applies your Sneak Attack if it is available to you.