Actually his powers were only limited by his power limit (the green numbers for his necroplasm) and imagination.
He could do pretty much everything
Teleport (also into his opponents)
Create matter out of nothingness
Change his appereance
and a shitload of stuff more
to what extent and if it's enough to hurt/take down Thor is the question though.
__________________
I am in your algorithm learning all your mannerisms
I'm already level with God
A million words a second and I know your imperfections, baby
I'm the only future you've got
Speak in diatonics, motivation diabolic
I'm like a religion, better locked in a box
Picture perfect image, more powerful every minute, baby
I am everything that you're not
He showed the capacity to telepathically mind rape, and empathetically channel pain.
He showed the capacity to teleport individuals over a great distance.
He has a Spawn version of the Penance Stare.
Control over Earth, Nature, and Creatures of the Night.
Some minor reality warp, matter manipulation, and spellcasting. Apparently an Earthbounded Hellspawn can become proficient with these, but Al never gave a shit about learning to master them.