Bitterhand was a high-ranking Dark Elf of Svartalfheim who was incredibly loyal to Malekith. She mainly worked in a trio with Wormwood and Grendell.
Bitterhand was created by Walter Simonson and Sal Buscema for Thor #377.
Major Story Arcs
This Hollowed Armor!
Bitterhand, along with Grendell and Wormwood, attempts to attack Thor whilst he is weakened. They initially gain the upper-hand, but Loki intervenes and stops them.