Necromplasmic Energy Manipulation: Spawn has vast magical powers. In the issues before issue #50, Spawn had a limited power supply or "9999". Each time Spawn used his energy, the counter would drain. Because of this, he relied primarily on his costume's natural abilities in fights.
Necroplasm Magic: Other than the counter problems he had, the only limit to Spawn's mystical ability was Spawn's imagination. Having been able to conjure up a car key using his mystic energy, materialize a cask of beer for his friends in the alley and even resurrect the dead at the cost of his necro meter.
Necroplasm Bombs: Spawn can expend necroplasm to cause bombs. A small amount, as little as 5 units have been used to take care of a group of men.
Black Energy Transferal: A rejuvenating energy transfer. Black Energy Transferal is a creature to costume kinetic energy transferal that can jump start the K7-Leetha Costume. Creatures such as rats or worms that never see the sunlight are particularly ripe with evil and can transfer more energy to rejuvenate Spawn's costume and body.
Shape-Shifting: In Spawn's early years, he did not have complete control over his powers. He spent 563 necroplasm units in an attempt to fix his scarred body, but only for a temporary time-period.
Soul Manipulation: Spawn can transfer the sins of others into himself and purify the souls of others.
Superhuman Endurance: Spawn's body is quite dense, weighing over four hundred pounds, and is composed completely of Necroplasm. This gives him super strength and a high degree of durability. While he still has internal organs, they are non-functional, and their damage/destruction does not hinder Spawn in the least. These organs re-appear when he magically regenerates his wounds. This may be due to Spawn's inability to let go of his human self, retaining his human organs even though he no longer requires them.
Superhuman Reflexes: Using K7-Leetha Spawn can react fast enough to block bullets with his autonomic nervous reaction skills.
Superhuman Strength: The combination of his Necroplamsically charged body coupled with the K-7 Leetha has given Spawn an indeterminate amount of physical ability. While initially only capable of pressing 5 tons of pressure, Simmons found he could further strengthen himself via use of his Necroplasm or by feeding on the malefic energies of certain animal life around him. While battling Urizen, Spawn was able to lift and throw an entire building with ease. During his battle with Anti-Spawn, he punched through his opponent's face even while he was wearing armor. He is also able to physically overpower normal humans and even other supernatural creatures.
Memory Manipulation: Spawn showcased a form of memory manipulation, where he placed a symbol upon Terry and his children's foreheads, and told him that by that next morning, they would forget they ever saw him.
Transmutation: Spawn specializes in Matter Manipulation. His K7-Leetha suit can transmute molecules around it to manifest what thinker needs if thinker knows fundamentally about the object and has a clear head and strong will.