Project NEXT kicks off on 09/17, which is when the Pass opens and the login‑rebate counter begins through 09/30 for Diamond returns tied to daily check‑ins. Obsidia is a Marksman with Bone Shards mechanics and very high single‑target DPS in mid‑to‑late game as highlighted in the spotlight.

The most cost‑effective route is to open the time‑limited Pass from September 17–30 and join “Save Diamonds, Get the New Hero,” where daily logins refund spent Diamonds so the hero can effectively cost as low as 0 Diamonds after the full rebate, delivering the same new Marksman, Obsidia.

Method 1: Pass + rebate

Open the Pass and log in every day to progressively reclaim Diamonds spent, reducing the net cost of the hero to zero after completing the cycle. Missing login days during 09/17–09/30 will reduce the rebate and raise the final cost.

Method 2: Battle Points

Buy the hero directly for 32,000 Battle Points during the same window without joining the Diamond rebate and without Pass bonuses. This is the simplest path when a large BP reserve is available and Diamond savings are not required.

Method 3: After the event

After the event window, Obsidia becomes available in the Shop at standard Diamond or BP pricing with no login‑rebate mechanic. If the Pass window is missed, this is the reliable fallback, though it won’t deliver Diamond savings.

Tips

Have a small Diamond stash ready to unlock the Pass on day one so every login day counts toward the full rebate. Financially, the Pass + rebate is the most economical, while the BP purchase is the most straightforward; both land the same Obsidia on release.