If you are using repack, you most likely get extractors (or otherwise it sucks even more hard, than most of repacks do) with it. All 3 maps can be about 2,5-2,7GB big, if you choose to use just maps, they will get much smaller. Only maps are really essential, vmaps and mmaps are optional. So, in general, when you don't have up-to-date map files for your custom zones, NPCs can behave in a really buggy and weird way, but what also can't work properly are custom graveyards, fishing loots, who lists, general chats and more area based stuff like that.ДЇirst of all, determine, which maps you want to have on your server. Again, optional, but in most cases good to have. So, basically, instead of just jumping on 10yd high rock, they try to find a way up on it. mmapsВ - Movement maps are here to give server information about collisions, so it can make NPCs move in optimal cases only though paths which would be reachable by player as well.They are just optional, but highly recommended to have. This gives server possibility to prevent NPCs from attacking players they clearly can't see, for example, NPCs from building's basement won't attack player when he's just going around building. vmapsВ - Vector maps are here mostly to let server know where are WMOs and their interiors.Its possible that they contain even more data (I honestly don't know), but this is the most important basics we commonly need maps for. mapsВ - Maps are here to let server know where are map tiles and which area IDs are on them (and where).TC extractors seem to be not very well written for modded clients, at least they used to be very bad whenever it came to extracting custom stuff. I know that my way of doing this thing may be rather unclean and someone might point out that those are not things one is supposed to do, BUT they prevent from happening absolutely all kinds of errors and mistakes I've ever encountered so far. There are actually quite a lot of people who keep having problems just because of either outdated server side maps, or because they can't extract them with modified client properly.

Wow change map size