Bog Wraiths

From MTG Salvation Wiki

Bog Wraiths are undead creatures, one of which was summoned along with a vampire and a frozen shade by Aldon who used the dark amulet. The wraith needed to feed on flesh or would dissipate, so joined with Dreygar in convincing Aldon to attack Dreygar’s Castle. When Dreygar was killed, the bog wraith remained an advisor to Aldon.

Bog wraiths also haunt the swamps of Takenuma on the plane of Kamigawa