third - Bluebirds that give great exp and tend to gather around u in a way they all can get hit in ur rage once oyu find the big hall with the big spawn of them you can get great exp and the spawn is loacated at cords 400-600 but its hard to find. the stardiamonds dropped by them can be exchanged for a random normal gem.
The fiend bats are huge blue bats that deal enormous magic damage and tend to chase you even when they arent on your screen so watch out of them thay also drop soul letter which needed to enter floor four.

fourth - I never been in it but they say it got about the same spawn as level 3 with huge hp and a lot of boss mobs that tend to drop soc equipment. the bullmonster looking like monsters drop (forgot)diamonds that can be exchanged for an ancestor box thats kinda like a moonbox, however it's not worth it getting to 4th floor anyway.

The minimap is disabled within the labirynth so if you go ina team watch out not to loose your teamates but its not hard to find your way to various places onceyou know the way since there areny many dead ends.

Theare are two things you can do inside the lab:
level - find the biggest spawn and whack it untill ur out of dura on ur equipment then go out ot repair
hunt - mostly as an archer you can kill bosses easily and hunt for earth tkoens which drop a lot and sell well as a na rcher it is reccomended to have 5-6 pot bundles 10 free slots and the rest put into arrows.

Also there are boss monsters in the labirynth like I mentioned and there are usually huge strong and rare to find. They tend to drop rare equipments when you do finish them.

2.at levels 90-113 mostly only trojans or warriors level at the labirynth 1st floor while collecting the skytokens and some god from the Seal Online Cegel once they can take the damage(need around 1.9k def)warriors should bring some pot bundles since even while taking -1 damage your hp will go down as the time goes.
you should collect the sky tokens and not go to the 2nd floor once you find one since it just sucks... and you'll need the sky tokens at levels 113+ just get as much as you can even if you have 20+ of them clogging your wh.

3.at levels 113+ archers might want to hunt the earth tokens
and the meeles should go to level 3 adn level there extreamly fast... use the sky tokens you collected from level one with earth tokens from your fellow archers at the market.