The tests I've conducted so far have been promising. While I still have some work left before it happens, I can now say that we'll be updating to Minecraft 1.13 Tuesday next week, the 23rd. I'll use the time before then to finish some needed software development along with ensuring that things are as stable as possible. A few minor items will likely be missing at first, but will be added back in when either myself or the original plugin authors take care of it. Those who have played Tasmastis should agree that almost everything is running as it should now.
This upgrade will also include a full hardware server migration which is likely to take a few hours at best. During that time, the entire network will be offline. Then, each game server's world will be converted one-by-one to the new format, coming online when ready. Laurasia will be last due to its size and complexity.
To all Tasmantis players: your inventories will be wiped when it gets merged in next week. It's important that you clear your entire personal inventory before then. This includes held items, worn armor and enderchest content. Placing all these items in regular chests will be enough to save them. I won't be able to retreive your inventory post-merge if you forget to do this, so be sure to take care of it in time!