User blog comment:NaiflidG/Relating to Alastair in "On the Head of a Pin" and "Caged Heat"/@comment-212.3.18.48-20141113113050

Honestly I've never thought about it this way. I've always thought about it like this: different demons have different powers and weaknesses, and this applies to all of them. Azazel for one reason or another had more powers, and less weaknesses, than most other demons. This is why he's immune to holy water, and Alastair maybe isn't.

The demon killing knife didn't seem to work on Alastair, nor did it work on Samhain. Lilith however seemed worried it might hurt her. This might just be paranoia though, because if she dies before the last seal is broken she has lost, 100%. Most "higher" demons can teleport, but it seems Abaddon can't. She can, however, extract memories, which no one else can. Maybe she can teleport, sorry if I slept after season 6. I kind of lost interest at that point.

I don't think she's ever confirmed as a teleporter though. When Crowley was locked up and sent out his demon message it seemed to take quite the while for her to show up, which seems to suggest she actually had to get there without real teleportation.

Abaddon also seems to have a quite obvious weakness to angels, running away when Gadreel is detected. Alastair, on the other hand, went into hand to hand combat with angels and actually seemed to be on the winning side until Sam shows up and saves the day.

Whatever logic Kripke intended with the demon system is certainly gone now though, so I guess we'll never truly know huh? It wouldn't surprise me if reapers were revealed to be vulnerable to holy water, to be honest. Nothing surprises me with this show anymore.