When you first start with the Fish Speakers guild, you will have six skills you can train:
Additionally, you can gain other skills as you advance in the guild.
Each profession has its own skill associated with it:
Scout:
Lethality - Adds damage to attacks equal to a percentage of opponent HP.
Medic:
Vitality - Directly raises your heal_bonus on a 1:1 ratio.
Warrior:
Carnage - Increases the damage and duration of all of your bleeds.
You will also unlock the Camaraderie skill at Guild Level 150. This skill directly affects your bond ability. Bond causes all damage you take to be split with your companion.
PK - Sense