Done several delves, a couple up to T7, and found that the Nemesis Strongboxes don’t seem to be worth taking any effort to upgrade. I’ve gotten to the end of several delves with a completely upgraded box and got nothing but some gold and a gray item worth a bit of money.
So far none of the rewards seem to be worth taking any extra effort to upgrade them. Obviously, if the Underpins minions are in your way you have got to fight them. But don’t seem to be worth any effort to go after.
I wouldn’t go out of the way to do it but if it’s in the path definitely go for it.
Eh, I never go out of my way to upgrade them, but I always get them fully upgraded.
The mobs are in the way and the effort to dodge them is greater than the effort to kill them.
I suppose it’s a different story if you got stealth or invisibility or something.
Just a nice bonus. Usually I get them just by doing the Delve anyway.
If you are farming runed crests in the higher tiers, doing the nemesis packs will get your more runed crests.
Edit; if you are running as a group though in T11, the health scaling on them is absurd and probably not worth the extra time they take.
mostly skip where I can especially if you do 11s in 5 mans they take like 5 minutes to kill that phone a friend guy with a group of 625-630s ends up with 20 adds before he dies solo they die in about 20-30 seconds in 11s
its good on bountiful delves got some curios from it