Can i play the new season without vessel of hatred?

The new season looks really cool, and even the berserk stuff, and id like to get back into the game again, i dont own vessel of hatred, so im wondering if its similar to the necromancer in d3? just a class unlock

Or will i be missing major endgame content if i dont own it?

You need vessel of hatred for some pretty important key components, such as runewords and mercenaries.
You can play the game without it, but your build will be “cribbled”

ah that sucks… i did not plan i did not expect to play d4 anytime soon but the new content looked really cool and i didnt budget for any games this month so i dont think ill be able to get the expansion, maybe on the next sale though! ty for answering my question though, i couldnt find an answer anywhere else