All three Skill Books he acquired were to be learned at Level 30, and they were quite impressive skills. Particularly Lin Luor's Healing Flash, an instant heal skill that was even more extraordinary. Coupled with Lin Luor's own equipment healing amount, the use of this skill was not merely for 2895 life points.
An instant heal skill is a dream come true for any support healer in a Priest profession. Its value is self-evident.
The Killing Commander's Assault Stance is a boosting skill. It is used on oneself and significantly increases the Attack Power. Skills like this that enhance attributes are actually quite rare. For high-burst professions like the assassin Killing Star, boosting skills are even more valuable than active attacking skills.
As for the Law Protector's Mana Recovery skill, well, having it is better than not!