I saw a really cool "Partial Vulnerability" homebrew by [u/MothProphet](https://www.reddit.com/user/MothProphet/) on [r/DnDBehindTheScreen](https://www.reddit.com/r/DnDBehindTheScreen/) last year which allows for a weaker version of Vulnerability/More tailored form of vulnerability where you don't just nuke the monster if it has that trait. [https://www.reddit.com/r/DnDBehindTheScreen/comments/injk9m/an_exploration_into_5es_damage_types_in_a_little/](https://www.reddit.com/r/DnDBehindTheScreen/comments/injk9m/an_exploration_into_5es_damage_types_in_a_little/) I think having certain effects tied to their weaknesses opens up the creative space for cooler encounters and making vulnerabilities more of a thing and rewarding people who have flexibility in their damage types rather than just doing whatever is the least resisted damage. Here were a couple of the traits they wrote up: > **Blighted Connection.** After taking necrotic damage, any radiant damage dealt by this creature is halved until the end of it's next turn. > **Flammable Flesh.** Once per turn, taking fire damage sets this creature ablaze, causing them to take an extra 5 fire damage. > **Explosive Fluids.** When a demon is reduced to 0 hit points from an effect that deals fire damage, they explode, dealing Xd6 fire damage in a 10-foot radius around them, with X being equal to half of the creature's CR (minimum of 1d6). > **Zuggtmoy's Rancor.** While the Devil is poisoned, it is unable to take the dash, disengage, or dodge actions, and if they have a flying speed, it is halved. Taking poison damage also causes the Devil to suffer these effects, except they only last until the end of their next turn. > **Conductive Scales.** The dragon has disadvantage on saving throws against bolts of lightning or spell effects that deal lightning damage. Alternatively instead of being just immune to lightning damage you could give Blue and Bronze dragons this: > **Superconductor.** Whenever this Dragon would take Lightning damage, it instead takes no damage and immediately regains it's breath weapon. There were a bunch of really cool ideas in that post and I'd recommend you check it out.