Arroth_Thaiel, I must be a blind man. I went back to the Origin Store, and there is High Seas right next to King's Collection. Are there any other booster packs that add content (capability?) as opposed to items? I already have a 7th character slot (at least I did).
It would probably be best to wait until you can use Stygian Abyss/Time of Legends, being at Mondains is seriously going to limit being able to check any of the actual new an used content out.
As for High Seas, Rustic/Gothic, and Kings Collection only consider them after you're for sure you will be playing for good again or they may just be overwhelming an not as appealing as the many other great new things to check out such as Mystic, Imbuing, Animal Training, New Loot Items, and too many others too list
I now have bought a one month subscription and looked around some. The layout of my enhanced client screens was a bit garbled -- things on top of things or out of place, etc. But everything is there. I even have 12 veteran rewards available! That lessens the loss of all my soul stones. Also, my account already has Stygian Abyss stuff enabled, although I don't remember upgrading it. I have email records showing my upgrade to Mondain's Legacy, but nothing for Stygian Abyss. Weird, but I'll take it.
A lot of the characters I looked at seemed to have boosted skills, such as several had a 100 level of Resisting Spells or Anatomy. I don't remember ever getting resist so high on any of my guys. Do some skills build even while logged out? Note that between 2005 and 2012 I kept my subscription active, but barely logged in. In those 7 years I probably played UO for less than 7 hours. I'm saying this to let you know significant time passed on my active account where some sort of automatic skill increase could be happening. I wouldn't expect any change from 2012 until now, while the account was inactive.
Yeah. i think all accounts were upgraded with Stygian Abyss sometime ago actually. I had continued playing but hadn't bought the upgrade and hadn't logged in for a few years and when I got back on I also had the SA content enabled without ever buying it.