Question 1

How many diamonds does Grock — Tremor of the Deep cost?

Accepted Answer

With both Starlight and the 7-day spend tasks active, Grock — Tremor of the Deep costs around 2,150 diamonds on average (equivalent to about 72 draws). This assumes the community average of ~100 crests per 10 draws. Without the spend tasks, the cost rises to ~2,450 diamonds. Without Starlight, it's ~2,250 diamonds. The absolute worst case (no Starlight, no spend tasks, no existing COA) is ~2,550 diamonds.

Question 2

What is the cheapest way to get Grock — Tremor of the Deep?

Accepted Answer

The cheapest path uses every available discount. 1) Activate Starlight Pass on day 1 (300 diamonds → 300 COA + 2 draw tokens + a free Starlight skin). 2) Use the one-time 10× discounted draw (350 diamonds for 10 draws, normally 500). 3) Do the daily 50%-off single draw every day of the event (25 diamonds × 30 days). 4) Hit all three spend-task tiers within the first 7 days by spending at least 500 diamonds on draws. 5) Hit the 20- and 40-draw milestones for +2 free draw tokens. 6) Pay for remaining draws at full price to close the gap. Total: ~2,150 diamonds, saving ~1,450 diamonds versus buying all 72 draws at full price.

Question 3

Is Starlight worth it for collector skins?

Accepted Answer

Yes — Starlight is effectively free during the Collector event. You pay 300 diamonds to activate, immediately receive 300 COA (which can be spent 1:1 as diamonds inside the event — net cost 0), plus a Starlight exclusive skin, plus the "Activated Starlight" event task grants you 2 free draw tokens (worth 100 diamonds). You pay 300 diamonds, you get 300 diamonds of value back plus a free skin plus 2 free draws. It's the single highest-ROI toggle in this calculator.

Question 4

How does COA work?

Accepted Answer

Crystal of Aurora (COA) is Mobile Legends' secondary currency. Inside the Collector event, 1 COA equals 1 diamond for making draws. Outside this event, COA can't be converted back to diamonds or freely farmed. Ways to get COA: Starlight Pass (300 COA per month), Lightborn events and special event bundles, recharge promos and limited-time quests, and some event rewards and milestones. If you've been saving up COA, enter your balance in the calculator — every 1 COA directly reduces your diamond cost by 1.

How much for the Grock Tremor of the Deep skin?

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Your strategy

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Your plan

Week 1 — Get set up

Weeks 2–4 — Daily grind

Close the gap

Frequently asked

How the math works

Reference