Royal Drill

Royal Drill14 000 CROWN in game 70 GRAM in the presale

Adds +130 mining power. The power of every drill you own adds up, so a new drill does not replace the old one, it stacks on top.

Shards per hour from this drill = 130 × 300 × buildings × boosts × depth

At current competition that is about 842,75 CROWN per day, paying back in roughly 16,60 days.