Kintabi

From Tardis Wiki, the free Doctor Who reference

The Kintabi were a species that, long ago in their history, were obsessed with power. However, on encountering another species like theirs, they became so horrified that they destroyed their technology and altered their DNA structure to keep themselves from ever again desiring absolute power.

When visiting their homeworld, Bernice Summerfield came across the last piece of their technology. It was destroyed in a fire fight between the Neo-Aretians and the Nimmari. (PROSE: Might)