Skill-ups
 

Any know what the lowest lvl mob is that will give me skill-ups(defensive) at lvl 54?

Using this site here it's -14 levels for 54 for exp stuff. What I think that site means by "exp" is dark blue, so you'll see exp greens at the high 30s. Look for something lv 39ish.

<3

Go through Highkeep til you find an old skool light blue guard, bound to be one just inside that range.