Dwarf star alloy
From Tardis Wiki, the free Doctor Who reference
Dwarf star alloy was an alloy obtained from white dwarf stars. It was very expensive and very heavy. It was the only material that could hold time sensitive species. (DW: Warriors' Gate)
Usage
Rorvik's space ship was made from dwarf star alloy and required very large engines to move. (DW: Warriors' Gate)
Cadwell had a gun that could fire bits of dwarf star alloy. (PDA: Fear of the Dark)
Roz Forrester used dwarf star alloy to crush an N-Form. (NA: So Vile a Sin)
Father Kreiner had a glove made of dwarf star alloy. (EDA: Interference - Book Two)
Father of Mine was chained with a chain made from dwarf star alloy. (DW: The Family of Blood)