The biggest issue with an Omni-element potion is that, if I make it possible, it'd probably have a steep Research cost, and it'd also run afoul of a lot of resistances and especially Immunities or Reflect effects. Running it with a full amp set would absolutely shred anything that doesn't have access to any of those, though, especially since Thunder would give it Block piercing by default.
It looks like I forgot to set the layer of that bookshelf after it's examined the first time. That'll be fixed in the update!