The Staff of Kolar, as seen in Supergirl Season 3 is a fictional staff created by the martian god H'ronmeer. The staff has the ability to atomize anything the wielder desires, as seen in Supergirl Season 3 Episode 3. The Staff is also a psychic weapon.
The Staff also has the ability to assist in the Reach, a martian ritual, allowing one martian to transfer their memories to their next of kin. (As seen in Supergirl Season 3 Episode 22). The Staff has killed hundreds.