Thread:Shabook/@comment-33907244-20180313104010/@comment-31763893-20180315141814

Yes, we do not know the powers of the Soul Stone. But we do know that it belongs to the definite set of the Infinity Stones. What I mean is that the "Infinity Stones" were mentioned as such in-universe, for example by the Collector in GotG. And we know that they can be put together on purpose (with the Infinity Gauntlet). That's what I mean when I write "definite set": an ensemble of artifacts of common origin (the Cosmic Entities) and with at least one known purpose (being gathered on the Infinity Gauntlet). Hence, despite not having the same powers or appearance, they are part of a consistent set.

On the other hand, regarding the Monoliths:
 * We do not know the origins of all of them (assuming they all have the same origin is a fair assumption, but as far as we know it's only speculation).
 * They have different and/or unknown purposes.
 * We do know that the combined destruction of three of them opened the Fear Dimension, but we do not know : a) whether this was intentional ; b) whether it was even known that such thing was possible ; c) whether the process could not be achieved through other means.
 * They haven't been mentioned in what I'd call the "Marvel mythology" just like the Infinity Stones have been.

If ever we see some Kree overlord telling "We Kree created the Monoliths to grant us infinite opportunities of travel through time and space", then we could reconsider the question of grouping the Monolith into one article. But given the few we know about the artifacts, in my opinion, gathering them in a single article is not grounded.