Spawner upgrades improve a managed spawner in three independent ways. Every upgrade applies to all units in the spawner and is priced per unit: a spawner holding 10 units pays 10 times the listed price.
Open the spawner (right-click) and choose Upgrades. The menu shows Level, Tank and Automation yield, each with the current value, the next value, the price per unit, the number of units and the total. Buying an upgrade needs the island permission Spawner Break. Purchases are confirmed safely: if a purchase is interrupted the menu shows "A purchase is being confirmed. It applies on its own and is never charged twice."
Level (production multiplier)#
Level multiplies how many mobs each unit produces (Spawner Production). Every level above I needs the island's Mob Mastery of that mob to be at least the listed level. A locked rung shows "Needs {mob} mastery level {n}".
| Level | Output multiplier | Price per unit | Total from level I | Mob Mastery level needed |
|---|---|---|---|---|
| I | x1.0 | free | free | none |
| II | x1.2 | $50,000 | $50,000 | 8 |
| III | x1.4 | $100,000 | $150,000 | 15 |
| IV | x1.6 | $200,000 | $350,000 | 22 |
| V | x1.8 | $400,000 | $750,000 | 30 |
| VI | x2 | $800,000 | $1,550,000 | 38 |
| VII | x2.25 | $1,500,000 | $3,050,000 | 46 |
| VIII | x2.5 | $3,000,000 | $6,050,000 | 54 |
| IX | x2.75 | $6,000,000 | $12,050,000 | 62 |
| X | x3 | $12,000,000 | $24,050,000 | 70 |
Tank#
Tank is how many hours of production the spawner stores before it stops (Spawner Production).
| Upgrade | Tank size | Price per unit | Total from the start |
|---|---|---|---|
| Base | 8 hours | free | free |
| 2 | 12 hours | $100,000 | $100,000 |
| 3 | 16 hours | $300,000 | $400,000 |
| 4 | 24 hours | $1,000,000 | $1,400,000 |
| 5 | 48 hours | $3,000,000 | $4,400,000 |
Automation yield#
Automation yield is the share of a mob's drops that collectors and mob robots keep when they harvest the spawner. Harvesting by hand always gives the full drops.
| Upgrade | Yield | Price per unit | Total from the start |
|---|---|---|---|
| Base | 60% | free | free |
| 1 | 65% | $200,000 | $200,000 |
| 2 | 70% | $500,000 | $700,000 |
| 3 | 75% | $1,000,000 | $1,700,000 |
| 4 | 80% | $2,500,000 | $4,200,000 |
| 5 | 85% | $5,000,000 | $9,200,000 |
Cost of a full upgrade#
Fully upgrading one unit costs $24,050,000 for Level, $4,400,000 for Tank and $9,200,000 for Automation yield, in total $37,650,000 per unit. For a 10-unit spawner multiply by 10.