Interesting quirk about Myriad - she is a true thief at heart. Can she get to another plane on her own? Not a chance in the Abyss. But, she could hijack someone else's supposedly secured/owned/sealed portal/gate. She basically does 2 things really well - she steals, and she lies. Those are really the only things she can do. She can just do both of those things in a lot of ways.
She steals:
- Loot (because...murder hobo)
- Identities (Changeling / Disguise)
- Lives (Sneak Attack)
- Secrets (Search / Listen / Gather Information / Listen to This, Detect Magic)
- Pre-Planned Defenses (Trap Finding & Disarming)
- Perceived safety (Intimidate)
- Privacy (Open Lock)
She Lies/bluffs:
- To Gate/Portal permissions to gain access (Silver Key class feature Master of Doors)
- About who she is (Changeling / Disguise)
- About what she can do (The feat Versatile Performer in Complete Adventurer, p. 112)
- About even being in the room (Hide / Sneak)
- About her attacks (Invisible Blade's Free Action Feint, Hidden Blade & Mosquito Bite)
- To Magical Items to get them to work (Use Magic Device)
- To get her way (Bluff, Diplomacy)
This was the foundation of her character design. The ability to do 2 things better than anyone else: Lie & Steal, in every way possible. That, to me, is what a "rogue" is. The planes are lucky she isn't an evil murder-hobo! lol