This weakaura tracks the debuff value for loose anima on Lady Darkvein (the number of containers that are open).
It uses a simple %tooltip1 to track this which isn't ideal as the tooltip changes slightly if there are 0 or >1 containers open.
0 containers open - will show the debuff damage per tick (e.g. 480~ on mythic)
1 container open - will show '1'
2 containers open - will show '2'
etc.