Yes, Table Mountain Vendor spawns items in your level range, so for example if you go there at level 60, it will spawn items in the level range of ~50-80 or something like that, not sure what the exact item level range is but it's not really important, it is a good way of getting good leveling uniques if you are feeling the need for better survivability/dps on your way to lvl 100.
Table Mountain vendors can spawn almost all non-synergiesMOD items, so if you want for example a Ring of the Succabi you just need to create an online game rerolling world, check the Table Mounain Vendor for the item, if it didn't spawn, just re-create the game until you do get it.
That is the reason why in my Warlock guide i have specific items as the "Fresh lvl 100" starter gear since you can get all of them by just rerolling the Table Mountains vendor until you get them.
Not sure if there is a Discord for TL2, but for SynergiesMOD i don't think one exists, simply because to play together you need the exact same MODS and there are so many differnt mods that the userbase uses that you would need to have a specific Discord (Such as "SynergiesMOD" Discord channel) to ever get even a team of 3 together, my own experiences with multiplayer in TL2 is rather bad, there is a bug that happens when you multiplay which sets you to level 1 and thus you easily die at those occasions, and when you have played the game for as long as i have, it's usually only hardcore which is "fun" and when i tried that in multiplayer i have died to the level 1 bug on all my tried (3 tries in multiplayer) while i have successfully completed all but 1 boss in Derinkuyu on Hardcore Elite difficulty playing solo, the one boss i haven't managed to kill on Hardcore yet is Kite, he debuffs you harder than Darkness Falls, quite unbalanced for a Derinkuyu boss and Salan changed the debuff values at some point and then left them unbalanced, seems like he liked having a really hard boss in Derinkuyu
The Clockwork scrolls has 3 varieties: Normal Mobs, Hero Mobs, Boss Mobs.
Playing Necromancer as a minion master enables the Necromancer to easily do the Boss Mob version of the Clockwork scrolls and minion master is great for leveling in general, tho it sucks for raiding since there are a lot of bosses in DF that you simply can't do as a minion master.
And if you haven't already read about it: Easiest way of getting the socketables you need (skulls) is to just kill the trash mobs in Derinkuyu since they quite often drop different skulls, also drops Vendor Boon Scrolls which is the fastest way of getting "Eye of Salan" which gives you 7% damage reduction instead of only 5%