Multitude (Soul Stone)

Multitude's powers and abilities

As a host to the Soul Stone, Ward appears to be the only host who can communicate directly with his stone and have the soul stone possess his body for its own purposes. The stone is made up of a legion of souls, which Ward can conjure as energy constructs. The more constructs he wills into existence, the less powerful they are individually. They are much stronger when he concentrates on a single construct.

The closer he is to other Infinity Hosts, the stronger he becomes.

Soul Casting: Through the Soul Stone, Ward can conjure constructs of living creatures. When he confronted Iron Man and Captain America, he manifested constructs of several supervillains, and eventually of the two heroes themselves.

The Soul Gem is sentient and has a desire to collect souls. Somebody in possession of the Soul Gem can use it to attack another's soul in various ways: The gem can reveal information by peering into another's soul or using the 'Cold Light of Truth.' The gem can trap souls inside itself in an idyllic world named Soul World, also allowing its user to access the memories and skills of those imprisoned there. The gem's power can circulate life and death forces on a planetary scale, revert beings to their natural state and give its user control over any and all life be it sentient or not. Additionally, the Soul Gem protects its wielder from soul-based attacks. The gem can disrupt the anima of a soul with a karmic blast rendering the target temporarily unconscious. Certain beings are immune to this attack.

Following the destruction and rebirth of the Infinity Stones, the artifacts formed a feedback circuit. Because of this, how much of the Soul Gem's potential somebody can tap depends on their mastery over reality, meaning that possession of the Reality Stone allows for a better use of the Soul Gem. In turn, possession of the Soul Gem allows for better control of the Mind Stone. The Soul Stone holds so much power that it can contain universes within itself, an entire Multiverse of worlds.