Despite his refusal to do any sort of relaxing activity, VEGA can tell that Doom Slayer has some extreme pent up trauma. Having to fight so many demons as your home world falls apart, VEGA decides to get him a little present. Sorry if any info is wrong, I'm halfway through the 2016 DOOM and haven't touched Doom Eternal. The art for the cover was made by Gabz (https://iamgabz.com/Doom-Eternal)