How to get New Lightstones?
Black Desert Mobile Guide
You can get new lightstones as rare enemy drops or rewards but the easiest way is to exchange Lightstone Fragments in the Pearl Shop. Lightstone Fragments are a bit easier to find and collect compared to complete lightstones since you’ll also receive them as Log-in Rewards and Daily Tasks.
You can automatically exchange your fragments to receive a random lightstone once the gauge reaches 100%. You’re also guaranteed to receive a random Epic or Mystical grade lightstone if you fused 60 lighstones (below Epic grade).