I'm going to try to list anything accessible to you, new and/ old across different genres, Strider.
Meshuggah - start with Obzen, then Catch 33 (this entire album is based on 1 primary riff), Nothing, Destroy Erase Improve, Chaosphere, Koloss, Contradictions Collapse. Meshuggah is the best 'djent' band around, hands down. Bands try to ape their style, every djent band is influenced by them and they're always 2 steps ahead of the game. Good time changes and very technical.
Immolation - Failures For Gods, Here In After, Close To A World Below, Dawn Of Possession.
Fear Factory - Soul Of A New Machine, Obsolete, Demanufacture.
Satyricon - Nemesis Divina.
Summoning - Dol Guldur, Stronghold, Oath Bound.
Suffocation - Pierced From Within, Despise The Sun, Human Waste, Effigy of The Forgotten.
Skepticism - Lead and Aether, Stormcrowfleet.
Deeds of Flesh - Portals To Canaan.
Disgorge (California) - Consume The Forsaken, She Lay Gutted.
Morbid Angel - Formulas Fatal To The Flesh, Gateways To Annihilation, Covenant.
Emperor - Anthems To The Welkin At Dusk, IX Equilibrium, In The Nightside Eclipse.
Numinous - Numinous.
Devourment - 1.3.8
Blut Aus Nord - The Work Which Transforms God, MoRT.
Darkened Nocurn Slaughtercult - Nocturnal March, Necrovision.
Shape Of Despair - Shades Of...
Evoken - Quietus, Antithesis Of Light, Embrace The Emptiness.
My Dying Bride - As The Flower Withers, The Dreadful Hours, The Light At The End Of The World, Turn Loose The Swans, A Map Of All Our Failures.
Wormed - Exodromos, Planisphaerium, Quasineutrality.
Ulcerate - Everything Is Fire, The Destroyers Of All, Of Fractures And Failure.
Defeated Sanity - Passages Into Deformity.
Gorguts - everything, start with From Wisdom To Hate.
Katatonia - first 7 albums.
Bolzer - Aura.
Deathspell Omega - Paracletus, Drought, Fas, Kenose.
Anathema - Judgement, A Natural Disaster, We're Here Because We're Here.
Alcest - first 3 albums and Les Discretes (the band) is better so check them out too.
Amorphis - Tales.
Carcass - Tools Of The Trade.
Birdflesh - Night Of The Ultimate Mosh.
Incantation - first 3 albums.
Rotting Christ - Triarchy Of The Lost Lovers, Non Servium.
Dissection - first 2.
Burzum - Filosofem.
Darkthrone - first 5.
Obituary - Slowly We Rot, Cause Of Death, The End Complete.
Deicide - Once Upon The Cross.
Vader - De Profundis, Litany, Revelations.
Sinister - Cross The Styx, Diabolical Summoning, Hate, Afterburner.
Cryptopsy - first 4.
Monstrosity - first 2.
Nile - Among, Black Seeds, Annihilation.
This isn't the basic stuff, it's just something off the top of my head and should give you some time to go through, plus depending on what you like/ don't like, I can throw in more recommendations specific to that sort of style/ genre/ whatever. There's much more. Thing is, like anime or movies, there's a lot out there but it's key to skip the bad stuff cos you don't want to waste your time with it.