I see in Epic Level Handbook there're some preset specific epic weapons that do not have +6 or more enhancement bonus. Like the following one:
Finaldeath
This +5 undead dread ghost touch morningstar also grants its wielder immunity to energy drain attacks. Furthermore, if its wielder is capable of turning undead, he or she gains the Positive Energy Aura feat.
Caster Level: 22nd; Prerequisites: Craft Magic Arms and Armor, Craft Epic Magic Arms and Armor, death ward, plane shift, summon monster IX, creator must be able to turn undead; Market Price: 3,580,308 gp; Cost to Create: 1,790,308 gp + 45,800 XP.
Does that mean that, despite of being an actual Epic Weapon, it cannot bypass the damage reduction that Epic Weapons are supposed to be able to bypass?
A few very powerful monsters are vulnerable only to epic weapons; that is, magic weapons with at least a +6 enhancement bonus. Such creatures’ natural weapons are also treated as epic weapons for the purpose of overcoming damage reduction.
Also, for those who have regenerate abilities that can only be stopped by Epic Weapons (like a Solar), would an Epic Weapon with no more than +5 enhancement bonus be counted as qualified? Or should I count it as "just a merely normal weapon but with an Epic special ability"?