Engineer - bomb/elixir support (dungeon PvE)
A good portion of Elixir Gun’s damage comes from condition which afaik the + 15% damage trait doesn’t increase.
If you only put 10 points into Tools take [Kit Refinement] instead, every 20 seconds you create a Super Elixir when you switch to the Elixir Gun. If you put 20 points into Tools for [Speedy Kit] using the adept major trait in Alchemy for [Invigorating Speed} is a good idea.