Note: This is a WeakAura for Vanilla WoW (i.e. Classic Era), it doesn't make sense for TBC due to the removal of Curse of Shadows.
A visual representation of which Warlock curses have been applied to the target mob. By default only loads in combat inside of raids or dungeon groups.
Additionally, the "Loatheb Decurse" aura triggers a sound and text warning when Loatheb uses "Decurse". This can be disabled by going to the "Load" tab of "Loatheb Decurse" and toggling on the "Never" checkbox.