"Invisibility Spell makes EVERYTHING except for Walls and Siege Machines invisible and untargetable within its radius."
| Level | Duration | Research cost | Research time | Laboratory level required |
|---|---|---|---|---|
| 1 | 3.5s | N/A | N/A | N/A |
| 2 | 3.75s | 5,000,000 | 3d | 9 |
| 3 | 4s | 6,000,000 | 4d | 10 |
| 4 | 4.25s | 7,000,000 | 5d | 11 |