Artificer and Construct Essence

[smeggy1384]

The Construct Essence feat now states that it gives 50% vulnerability to rust damage. <-- From test release notes.. Curious how big of an impact that will be end game. Are rust monsters only a problem in a few low level dungeons, or is that a bigger issue later on? Have the feat on my live arti, only level 16 and there are a lot of quests i have yet to do. Is this something to worry about if it goes live?

Edit: Thought i would copy my live arti over to test, cleared out my chars on test (one of which had the same name as the live one), then i started the copy process. All it says now is failed, am i just out of luck on trying that character out there?