Originally posted by DarkSaint85
Yeah, but imagine if Warlock tried to use the Soul Gem...Vampires have no soul!!!
Batman will take the opportunity to bite him!!!
You have to go back, and see how classic Warlock fights. He's there, and gone before your very eyes. The Soul gem doesn't just suck souls out of the victim, it can also release karmic blasts, not to mention that Warlock has cosmic powers.
As for what the Gem can do
The Soul Gem is sentient; it has a desire to collect souls
The gem can 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.
The gem's wielder can access the memories and skills of those imprisoned within Soul World
The gem can revert beings to their natural state.
The 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.
Recent notable abilities
Spell-Crafting: Adam Warlock has the ability to crafts "spells" with his "Quantum Magic" for a variety of desired effects. With this ability he has deleted a Witch Mark from his body cased by Magique in which was known to be impossible to do In conjunction with his Energy Manipulation, Adam used this ability to create large explosions and merge timelines. Although the total capabilities of this power is unknown, he does require adequate power depending on how grand of a feat he wishes to perform.
Soul Manipulation: Adam has the ability to manipulate souls. He seems to still retain this ability, despite having this ability before the events of Annihilation. This may be because this power was gained from the use of the Soul Gem over the years. He was able to reforge Phyla-Vell's sword with the billions of Kree souls around him.
Energy Manipulation: Adam has been seen able to manipulate his Quantum Magic to generate force fields in which could withstand the explosion of a star and produce concussive energy blasts which were powerful enough to dent even Ultron in his giant form during the events of Annihilation. Powered by the Universal Church of Truth's faith, Adam Warlock manipulated the power of Terrigen Bomb that was powerful enough to destroy the whole reality and merged 2 timelines.
Matter Manipulation: This is another power Adam seem to retain under his Quantum Magic from since his rebirth. Adam transmuted the mineral content of a planetoid in the Disradi System into an unknown ultra transition metal that didn't exist. Prior to his rebirth in Annihilation, Adam has been seen able to turn hounds into humans, transmuting bullets into water, transmuting parachutes into air, and shrinking monsters with the use of the Soul Gem. He's even been able to turn Thanos into stone without the actual Soul Gem.
Energy Construct: Although seldom used, Adam has ability to construct something out of Quantum Energy such as a sword or a piece of armor.
*Note*
To keep from over-hyping Warlock, and making him seem greater than he actually is, it takes concentration to pull off some of his power stunts. So this must also be taken into account when arguing what he could actually do in the heat of battle.