The Tenth Doctor was forced to give an old Time Ring he found in his TARDIS to a Dalek in exchange for it sparing Earth.

Later, Kate Yates used the Time Ring to put a force field up around the Dalek. After that, she used her Dalek knowledge to set the Time Ring to self-destruct. The Time Ring's destruction caused a warp implosion, imploding the Dalek into atoms and making all the windows in a twenty-mile radius shatter. (PROSE: I Am a Dalek)