Quad DoA run in Hard mode

Oh thanks. that explains it! However, I still have another question. Does the 4-area run has to be in 1 run or can be 4 different runs? I remember I did Gloom first and got a Torment Gem at the end; another day I did Veil and got only 1 Stygian Gem at the end too. So looks like you have to do 4 of them in 1 run? Yes, you have to do all areas back to back. They are all connected once inside, you finish one and a gate opens giving you access to the next area.
In the first area you get 1 gem, the second 2, third 3 and fourth 4 ( well unless you do it in hard mode, and then you can double those gem drops).

Standard balance build. Nothing special skill-wise. Normal hairy situations like cave in Gloom, room 2 in Foundary, snake run in Foundry (we decided to play it safe by clearing the room before doing snake run, it paid off!)
Other drops were pitiful, only 3 titans dropped extra, and only 3 greens dropped altogether! Hi nice job. But what is a snake run, could you explain pls?
I never completed foundry..yet, My team always dies after the 4th room (when cleared), when you have to take out the farrest titans..

Snake run is to escort the 3 prisoners (snakes) back to safety. Once you activate each snake, a whole lot of mob pops up every time and you have to keep the snake alive otherwise gg because you need them alive to trigger the Black Beast of Augh, and then the Fury.

GuildWiki has this quest documented quite well. Aha... I see. That's why I didn't know because I've never came that far. Everytime we have a tank, it seems they never know where to tank so he can block them in the last room (where the snake quest is). The first few mobs they know (between the wall and another thing in the beginning), but the last mobs at the end, where can he tank and body block them, can you help me with that?

many tnx