Originally Posted by
Netherblood
Basically in the maw you grind this resource called Stygia. It costs Stygia to buy sockets for your gear or conduit upgrades. It takes about 2 days for a conduit upgrade and a week to farm for 1 socket. Any time you die in the maw you lose 20% of all your stygia, which you can recover by getting back to your corpse and looting. If you die again before you can retrieve that stygia, it is lost forever. This is unlikely to happen in pve if you play carefully, with warmode on the risk of dying goes up a lot though.
As far as I know warmode bonuses also don't work on earning Stygia or rep in the maw, so there is no benefit to it in there outside of abilities.
You can lose a lot of farm time by dying in there repeatedly, which can't be made up because there is a cap on how much you can farm in a day.
Also be careful of edges of the world there, in some places if you fall off into abyss and die you can't retrieve your stygia since your body fell into the abyss, so you lose 20% forever from 1 death.