To reach valteras lab you'll need a iron broad sword that drops from either a disfigured lizard man or a tattooed lizard man. Once you reach the prison gauntlet you need to kill the gaoler head north then walk up.
If you obtain the blood acolyte's collar you can skip the prison gauntlet by wielding the acolyte's collar and write 'enter laboratory'. To get the blood acolyte's collar you need to kill the lair boss inside Valteras Lab. All the steps needed will be presented below:
To obtain the blood beads of valtera (from beginning of lab):
,[pack left][pack right]2s[sw][praise be to magic][get beads of blood][ne]3s[ne]2s[ex floor][get wrought-iron charm][mix]
To obtain the caretaker's badge (from the end of last speedwalk):
Once you have the caretakers badge you now need to kill 2 mini-bosses, I suggest a figthers or rogues takes someone with them, since they have a lot of physical absord, mages should be able to handle them fine.
To reach the first mini-boss (from the end of the last speedwalk)
Once there, hold the badge and write show badge and enter the room to the north, and pick up the chain dropped there.
To reach the second mini-boss (from standing in the room of the first one)
Once there, hold the badge and write show badge and enter the room to the south, and pick up the chain dropped there. Mix the fire and ice chain which will leave you with a frozen chain of fire.
For the next part i suggest you bring at least 2 additional persons in order to kill the final lair boss, make sure you have someone killing of the lab rats.
If you already had a party with you this speedwalk will take you from the second miniboss to just outside the lair boss.
Once Here write use chain whilst holding it, and head east to kill the head researcher and get your blood acolyte's collar.
If you did not have a party with you use this speedwalk instead from the entrance of lab:
Once you're done
Speedwalk from dibblers to prison gauntlet to use if you have the iron broad sword and the blood acolyte's collar (if you dont have the collar it still takes you to the prison gauntlet)
,n2e[ne]2[se]7e[se]2e3[ne]n[nw]w[sw][nw]w2[sw][pack right][hold iron broad sword][insert iron broad sword][hold collar][enter laboratory]