The test spavners are only in the test rooms. Come close to 14 blocks — the spaver releases a wave of lobes, and when all are defeated drops the reward: 50 percent test key, otherwise supplies. Then he rests for 30 minutes.
With the effect of the Test Sign, the spavner becomes sinister: the mobs are larger, they come with guns and bronchions, and the sinister key of the test is rewarded in 30 per cent of cases.