This is helpful in most catacombs and necros you can just check on your map and see where your character is and take another character on top of that location and say your deep in a cat and dont wanna run back through all the mobs for SS or anything else for that matter just put your other char on top of your first char and target them by /target "name" and click exchange.
If all else fails try The MMORPG Exchange L2 Adena . MMORPG-Exchange has supplied me for years and has great customer service and 24/7 instant delivery.
Lineage 2 Adena.