Experimental spray is an item given to the player by the slayer master Chaeldar in order to complete the special Slayer challenge she assigns. It is used to fight Mutated zygomites, a species of creature native to the city of Zanaris.
This spray is used in the same way as Fungicide spray; there are three possible outcomes:
- "The experimental spray has sent the zygomite into a furious rage!"
The zygomite temporarily turns red, heals a bit, and attacks faster. It can be killed by reducing its life points to 0, without needing another application of the spray.
- "The experimental spray has healed the zygomite!"
The zygomite temporarily turns green and its life points are restored to maximum. It can be killed by reducing its life points to 0, without needing another application of the spray.
- "The experimental spray has killed the zygomite!"
The zygomite is killed.
The experimental spray does not have charges like the regular spray and apparently can be used against more than 10 zygomites. The chatbox tells the player when it has been used against 10 zygomites (so the player can then go end the challenge). When the player finishes the challenge by speaking to Chaeldar, the experimental spray disappears. The spray cannot be used to kill more than the required 10 zygomites.
If the experimental spray is dropped or lost during the challenge, the player can get another by speaking to Chaeldar. Also note that you do not actually have to kill the 10 zygomites, just use the spray on them.