I'm only a paladin not a warrior but I would just level up gladiator and pugilist because you can't use lancer skills when you get your warrior job. I would highly recommend getting your gladiator to 22 for provoke since you're already at 16. Here is some information about cross class warrior skills I found in another thread:
Quote Originally Posted by Pexx View Post
Featherfoot - One of the best defensive skills we have access to. Dodging works on many boss skills, including magic damage.
Convalescence - Increases effectiveness of heals incoming to us. It does stack with our Wrath stacks. However, it does not work in conjunction with Inner Beast or Bloodbath.
Provoke - Another really great skill. Most consider it worthless because they don't understand the mechanic. It is a skill that matches the highest enmity against the target plus one.
Internal Release - An offensive skill that we can utilize for defensive purposes. Since Inner Beast heals for a percentage of the damage we do, this includes damage done through a crit.
Second Wind or Mantra - Second Wind is a useful skill that helps recover health in a tight spot and can be used with Inner Beast to help maximize the health restored. Or, you can opt for Mantra to use with max Wrath + Thrill of Battle + Convalescence for a total of 55% more healing.
Warriors are getting changes in patch 2.1 coming this month and their healing mechanics are being changed. So the healing information might not be accurate anymore.