Put special Alchemy machines in Moorcroft and Emberlight that would allow players to craft Vials with materials and small amounts of energy (2-5). It wouldn't unbalance the game much because players are already able to bring them from upper levels.
For example:
Poison Vial ( 3 Green Shards, 2 Gel drops, 1 Waste Module, 3 Energy),
Curse Vial ( 3 Dark Shards, 2 Ecto Drops, 1 Grave Soil, 3 Energy)
Etc.
Post what you think about this idea!
Well, vials are the definition of "consumable". I'm not sure if anybody would be willing to sink energy into this.
I don't think we need yet another energy sink, but a material sink would be highly appreciated. So make them craftable, include the recipes in the machines (not unlike the one for the krogmo trinkets) and have them use the materials that are usually vendored because no one needs them.
Come to think of it, the T2/T3 vials could use up quite some amount of materials.