Metallic Gas
Seems to bond metallic tetrahedrons to various sections of the nervous systems, a sort of metallic coating of the nerve fibers.
Nano Dosing is suggested. Large doses are confirmed to cause long-term mental derangement. Krypton Nitride is very safe when taken in very small nano doses and allows for the gradual tuning of the permanent changes to the residual crystalline coating of various nerve bundles.
1d3 doses. One dose can be used per turn. +1d6+3 happiness per dose. a very rare drug.