Zarius |
By RAW, no. If you're not playing Pathfinder Society, talk to your GM, they might work with you. If you ARE playing PFS, no. Rajnish is 100% correct. Take a look at the Create Demiplane spells for specific examples of what you'd be looking for.
If you're NOT playing PFS, he might let you enchant the weapon as-if making a Wondrous Item and, while not being permanent, allow X-per-day castings of it (Something my GM would allow.)
Zarius |
I'll be entirely forthright about this, though. Make it a +5 weapon. Is that expensive? Yes, it's a 50K enchantment. But that permanently bypasses Cold Iron (+3), Silver (+3), Adamantine (+4), and all alignment-based DRs (+5). The key downside is the cost. But there's ways around even that. For example, you can quest for it (even in PFS). You can have a mage that can make Magical Arms and Armor, either in your party or an NPC who owes you a favor (gotta be one hell of a favor, though, to owe you a month or two at no pay). If you're NOT playing PFS, getting your paws on an Artisan (third party class, WICKED for building things.) You can also steal one. There's a number of spells that CAN be made permanent that would prevent scrying.