Imagine this, you are facing an enemy with melee damage vulnerability as well as global fire damage vulnerability(usually beast enemies have that one). Why don't you combine those two damage types in one in order to deal massive amount of damage at once? Fire engulfed baseball club or electrified fire axe and etc.

While in battle, the player could have an option to put temporary buff on their melee weapon using "Focus". It could take one turn in order to deal triple damage in the end(high risk/high reward), or you could do it instantly but the damage should be lowered.

In the recent update finchly mentioned something about a enemy assuming a stance at one point, perhaps there could be a Psi-stance you could assume as the player that would apply a elemental damage type that would affect your melee strikes, possibly draining your focus meter when you make a strike, or as you said a temporary buff. (I imagine it will be a ultra glass cannon build, as high Libido, and lust with how QTE event's work will turn every grapple into a jump scare of thousand input arrows)