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This sounds a lot like the awakened invasions, except a bit more fleshed out? With probably a bounty-like boss at the end. I hope it's interesting (and challenging) if they plan to make this a cornerstone of the new legendary armour and the expansion.
I've done DT2 pretty much up until the bosses, I'm around combat level 90 on my ironman and I think this one's a bit too much for me right now. Not in a rush to get the quest cape back anyways now that lummy elite's done! The story has been lovely though, the mahjarrat storyline is a classic and I'm pretty excited about the osrs implementation. Ritual of the North (?) was one of my favourite quests.
Yesterday I finished the medium combat achievement tier so I can do some barrows and other than that I'm mostly thieving and farming. A great time, honestly!
This is where I proudly lost my HC status at like 300 total trying to pick up some snape grass.