Try this
Genetic Hellplant
at battle.c replace the existing code by this code
case GN_HELLS_PLANT_ATK:
md.damage = sstatus->int_ * 13 * skill_lv * (10 / (10 - pc_checkskill(sd,AM_CANNIBALIZE)));
Hell plant damage will be 18k fixed.
Shadow Form
at skill_db.txt
2287,13,6,1,0,0x1,0,5,1,no,0,0,0,none,0, SC_SHADOWFORM,Shadow Form