Monolith of Fate is far better than what it used to be, but I think the new version could use some tweaks as well. Right now, most echoes aren’t particularly hard, even when you stack a full set of enemy modifiers. They also lack variety and purpose beyond grinding for blessings and certain rare drops.
My suggestion is to add variable mechanics within echos, depending on the echo objective, which add difficulty when a player wants it. It keeps the existing stuff intact and accessible for casual players, but gives players seeking a challenge more to chew on.
For example, if the objective is to kill Admiral Harton, there could be items to activate throughout the echo that add difficulty to the fight (each with their own twist), but also give the player a reward (like “a rare affix will drop” or something). Players could activate as many or few of these as they like, but of course if they bite off too much they’ll die and lose progress.
If the objective is a forge, let’s have it really be a forge. Right now, it doesn’t make sense that a forge would spawn random enemies. Why not make the forge actually a forge? Throughout the echo, perhaps certain rare mobs will drop some sort of item, called it an “imbued metal” or something similar. Once again, they add a modifier to the forge encounter in exchange for a reward. The player inserts the desired item into the forge, which they must now defend from waves of enemies until the metal is forged into the reward(s).
I don’t have a similar suggestion for the spires because I don’t know how to improve on that. I think spires are probably a dud and should be dropped in favor of a new sort of objective, or better yet, more than one new objective.
I also think that MoF could use a way to tie the system together. Presently, they are six separate and unrelated systems, and other than the quest echoes and bosses, there’s not much difference in what you’ll do in any of them, and there’s nothing connecting them together. It would be nice if they were building to something more than being able to empower two of the six, and I think that “something” should be unifying and cohesive. I also think that certain objective types could be unique to a particular monolith, which may add to its identity.
Thanks for reading my rambles!