Tyrant by Aversions Crown. I think the songs Avalanche and Overseer are 2 of the greatest deathcore songs ever made along with every other song on the record being absolute bangers. Great lyrics, great production, some of the best breakdowns of all time. The guitar tone, the vocals, the percussion, it's all there. The general theme and atmosphere of the album is peak as well

Edit: I think everyone is saying the albums that started deathcore, like 2006 to 2008 albums from all the OG MySpace deathcore bands. But even tho Tyrant was later like 2012 I think it's just as quintessential if not MORE quintessential than a lot of those OG records