past few weeks i have been testing various mod packs for their compatibility with the most popular mods, for multiplayer purposes. i have rly been stressing about it, since i have a bunch of friends to play tl2 mp with, and we can't wait no longer.

since both mcmm and essentials r suffering from same problem as most mod packs, e.g. multiplayer host crashes when used with synergies [and awesome classes reborn mod in our case], i'm starting this topic to try to find the underlaying cause.

from our testing, we have found that these crashes happen when:
1. party plays a map,
2. party promotes in lvls,
3. a party member uses skill points to upgrade skills,
4. the party member switches map,
5. the party member loads new map,
6. another party member switches to the same map,
7. host crashes at the point 2nd party member joins the new map.

so, what actually causes the crash is something in skill upgrade. if party doesn't use any skill points before a map switch, game works. this crash, once skills get upgraded, sticks even after reloading such game. however, it clears if the affected party member uses skills respec to get skills to zero before another member joins the map.

what's also problematic is that not all classes r affected, meaning only some classes had skills upgrade issue during our testing. in our case it was nethermancer from awesome classes reborn mod and its passive skills. however, it seems obvious that other classes r affected the same way, considering how many other ppl report the issue.

while i have no idea what could actually be the root cause, i guess the 1st thing to look for are mod changes that affect skills in some way.

also, judging from experiences with other packs, the underlaying cause could be something that changes basic gameplay, such as quest fix, LMB changes in synergies, and a similar class/skill based functionality that appeares both in synergies and these mod packs.

i could only hope we may find this soon, before i lose my patience and create another mod pack which fixes this issue.