Be warned it has a cool down of one minute and thirty seconds and it only lasts 15-18 seconds depending on the level 4story Luna you have the skill at. The skill right below it on the skill tree is called Air Shield this friends is a very useful skill. It's one of the major buffs that an archer gets and it's self explanatory it gives you an extra boost of defense and it's time of effect is higher then it's cool down time so there is no excuse to never not have this skill in effect.
Finally the bottom skill on the right side of the tree is Lapiris Blessing. This skill is extremely good in PvP when you know your opponent is going to attack you with something hard and heavy, on the other hand very useful for getting away from large groups of monsters who is soul intention is to kill you as quickly as they can. That's all we can really say about what skills to get from all three sides of the skill trees in 4Story.