open skill.h , search SM_BASH , click those and see what their done
http://i.imgur.com/3iCI9.png
http://i.imgur.com/Cdlf6.png
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1. define new skill name in skill.h
2. define its type in skill.c by add case in ''skill_castend_damage_id'' , ''skill_castend_nodamage_id'' , ''skill_castend_pos2''
those mean : will create 'point' skill, no, and area.
3. define its power
4. build
5. add new db into skill_db.txt and skill_require_db.txt
6. add new date into your client.