Will my necrotic-damage-heavy PC be too weak in Curse of Strahd?

I’m preparing a character for Curse of Strahd, which I have never played before. This character uses a lot of necrotic damage. I don’t mind if this character is not the absolute best choice for this campaign, but on the other hand I don’t want to be too underpowered.

Keeping spoilers to a minimum, is relying on necrotic damage a poor choice for this campaign, or is it just a minor issue?

Specifically, I’m looking to play a Hexblade Warlock with Hex and Arms of Hadar – both necrotic.