Something that is in every woods.
Briars, picker bushes, so on and so on. There should be area's that cause a single or even double tick of lag for moving through them because of those nasty thorns on those equally nasty bushes.
Rangers and Druid would of course get the "free movement" to move through them without lag because well... they know their "home".
or even if it can be coded, why not have it cause some damage too? if you spam twice through a "braired space" you can move through it normally while taking some damage without the free movement perk.
This could add a whole new dimension through running through spaces, and make people think twice before running from one corner of the map to the other.

