Curse of the fallen angel of Greed

Venca; "No such thing as too much."

Fallen vessels; You can extend 2pts to deal a extra 2d4 necrotic damage, stacking by 1d4 for every point after that

You gain points by killing, your limit is twice your level. You have to land the killing blow to gain the point.  Alternatively, you can offer something of great value to Venca to gain the same effect.

You always know the value of something.

The fallen angel is always willing to give you whatever you want, for a price.

2 pt; Give yourself a +1 to any save; or impose a -1 to any save. 

3 pts; you can give yourself advantage on any throw.

7 pts; Automatically pass any roll imposed on you

These are some examples. These must be used before you have to roll.