Can't dig out of your cave/house, as monsters wall-hack-follow you.
"It's meant to kill you".
There has to be balance, one can just make a point like: "Well, if it's meant to kill you - just up mod frequency by 1000%, mob spawn rate by 10000%!, now that'll show the player who's the boss here, oh I forgot to add one more thing - they spawn at day-time too!"; I clearly don't think that having monsters with 3-5+ mods, 500+ regen/1up, etc. constantly and on first days is balanced, as it poses no real challenge.. it is just cheap 1-shot mechanic being labeled as "difficulty". It brings nothing more but frustration.
This is kind of stuff you're engaging on first days, by far not the worst.
There are plenty of mods combined that will kill you, but currently nearly every pack has either one or more such mobs.
Also what do you mean by "fortify"?
If you don't like this pack because its too hard then don't play it. This pack isn't for the casual player. Hint the name "Death's Hardcore Pack"