Known sources of coins
A regular rift legendary drops ten boss coin pickups worth five and ten legendary coin pickups worth eight, totaling 130 base coins before applicable modifiers. Treasure enemies scatter extra coins. Daily mission examples award 150–250 coins, and normal gacha duplicates refund 15/30/60/120/300 coins by rarity.
Permanent coin bonus
The Fortune coin upgrade adds 8% to its coin multiplier per purchased level, capped at eight levels. Its base cost is 120 with 1.45 growth and ten-coin rounding. It belongs to one partner; do not treat it as an account-wide farming bonus.
A spending rule that avoids dilution
Upgrade the partner you actually use. Compare a survival improvement with Fortune’s delayed return rather than assume the coin bonus is always the first purchase. An exact break-even run count needs your measured run income, so no fabricated hourly rate is provided.