I have done several runs in The Pit and not received any Obducite for it. This has happened over a couple of days now.
Obducite only drops on Pit Tier 30 and below, anything above that gives 0 Obducite.
Obducite is 0-30
Ingolith is 31-61
Neithiron is 61+
BTW you can convert higher materials to lower at the Alchemist.
No, as in, I am not receiving any Tempering mats from The Pit. At all. Any level I run.
Are you opening the chest at the end or not recieving a chest at all?
Only thing would be if you dont finish within the timer.