hello i think what you need is not hard to do it, if you whant the bosses to not have special ability only hit players then you can remove the script_names for each from the creature_template or you can setup the health of them much lower from the same table but also there is another trick that can be done from the worldserver.conf this only a example
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#
# Rate.Creature.Normal.Damage
# Rate.Creature.Elite.Elite.Damage
# Rate.Creature.Elite.RARE.Damage
# Rate.Creature.Elite.RAREELITE.Damage
# Rate.Creature.Elite.WORLDBOSS.Damage
# Description: Mulitplier for creature melee damage.
# Default: 1 - (Rate.Creature.Normal.Damage)
# 1 - (Rate.Creature.Elite.Elite.Damage)
# 1 - (Rate.Creature.Elite.RARE.Damage)
# 1 - (Rate.Creature.Elite.RAREELITE.Damage)
# 1 - (Rate.Creature.Elite.WORLDBOSS.Damage)
#
Rate.Creature.Normal.Damage = 1
Rate.Creature.Elite.Elite.Damage = 1
Rate.Creature.Elite.RARE.Damage = 1
Rate.Creature.Elite.RAREELITE.Damage = 1
Rate.Creature.Elite.WORLDBOSS.Damage = 1
#
# Rate.Creature.Normal.SpellDamage
# Rate.Creature.Elite.Elite.SpellDamage
# Rate.Creature.Elite.RARE.SpellDamage
# Rate.Creature.Elite.RAREELITE.SpellDamage
# Rate.Creature.Elite.WORLDBOSS.SpellDamage
# Description: Mulitplier for creature spell damage.
# Default: 1 - (Rate.Creature.Normal.SpellDamage)
# 1 - (Rate.Creature.Elite.Elite.SpellDamage)
# 1 - (Rate.Creature.Elite.RARE.SpellDamage)
# 1 - (Rate.Creature.Elite.RAREELITE.SpellDamage)
# 1 - (Rate.Creature.Elite.WORLDBOSS.SpellDamage)
Rate.Creature.Normal.SpellDamage = 1
Rate.Creature.Elite.Elite.SpellDamage = 1
Rate.Creature.Elite.RARE.SpellDamage = 1
Rate.Creature.Elite.RAREELITE.SpellDamage = 1
Rate.Creature.Elite.WORLDBOSS.SpellDamage = 1
#
# Rate.Creature.Normal.HP
# Rate.Creature.Elite.Elite.HP
# Rate.Creature.Elite.RARE.HP
# Rate.Creature.Elite.RAREELITE.HP
# Rate.Creature.Elite.WORLDBOSS.HP
# Description: Mulitplier for creature health.
# Default: 1 - (Rate.Creature.Normal.HP)
# 1 - (Rate.Creature.Elite.Elite.HP)
# 1 - (Rate.Creature.Elite.RARE.HP)
# 1 - (Rate.Creature.Elite.RAREELITE.HP)
# 1 - (Rate.Creature.Elite.WORLDBOSS.HP)
Rate.Creature.Normal.HP = 1
Rate.Creature.Elite.Elite.HP = 1
Rate.Creature.Elite.RARE.HP = 1
Rate.Creature.Elite.RAREELITE.HP = 1
Rate.Creature.Elite.WORLDBOSS.HP = 1
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so the point is try to adjust the =1 with the value damage you whant if you whant half of damage try 0.5 if you whant only 25% damage then do 0.25 etc