Sunspear skills are PvE skills, and thus differ from regular skills in many ways. First, they cannot be used in PvP; all Sunspear skills are marked as PvE-only. This means that they cannot be unlocked on your account and thus cannot be learned with Skill Tomes. Secondly, they cannot be used by heroes. Finally, they are generally more powerful than standard skills.
Note that the stated ranges for these skills only go up Sunspear Castellan (rank 8), but will improve up to Legendary Spearmarshal (rank 10).
General Sunspear skill
The only profession-independent Sunspear skill is the Sunspear Rebirth Signet. This skill is acquired by speaking to Runduk at the Sunspear Great Hall after reaching the rank of Sunspear Sergeant. See the skill article itself for more information.
Signet. Resurrect target dead party member at your location with full Health and 10% Energy for each Sunspear rank you have attained. This signet can only be used once per mission unless recharged by a morale boost.
Shout. For 4 seconds plus 1 second for every 2 ranks in Leadership, all party members within earshot take 20...35% less damage. Affected party members are healed for 35...60 Health when this shout ends.
If you acquire a skill not tied to your (main) profession, the skill will not appear in the Sunspear skills area of Skills and Attributes panel until you change your secondary profession. It will appear in the appropriate skill area of the secondary profession.