Shadow of Moil strikes me as the Warlock's equivalent of Greater Invisibility, with a few perks. One major point of contention among my party, however, is whether or not it grants the user advantage against enemies that see it.
While Greater Invisibility grants advantage by attacking unseen, Shadow of Moil grants the user the heavily obscured condition, which renders all enemies viewing the target as effectively blinded. Attacking enemies with the blinded condition imposes advantage.
However, The Player's Handbook Errata clarifies:
A heavily obscured area doesn’t blind you, but you are effectively blinded when you try to see something obscured by it.
How am l supposed to treat Shadow of Moil's effects, RAW?