Mr. Chakrabarti is w2s from patni.
Once you enter the room, you can ASK MAN MISSION and he will tell you about Tamisra.
He will give you two options for the difficulty of Tamisra, caution and bravely.
ASK MAN CAUTION or ASK MAN BRAVELY to choose which difficulty you want to do.
Caution can be done easily by a couple of level 45s, while bravely takes a larger group like SL2.
Before entering Tamisra, you should make sure you have sufficient pieces of food.
Thirty pieces of bread from either the weary srethsin or the patni should be enough.
The type of food makes no difference, so don't waste your time/money getting roots.
Once you are ready to enter, ASK MAN READY. This will teleport your group into the instance.
You will find yourself in a room with four exits. Each exit is a dead end with a prisoner in it.
Your goal in Tamisra is to keep yourselves and the prisoners alive while defeating all of the yamadutas.
When you enter Tamisra the prisoners will be hungry, go to each one and give them a piece of food.
You will need to do this each time you get an area message telling you the prisoners are hungry.
This message is hard to miss, as you will see four of them (one for each prisoner).
In a set period of time after entering Tamisra, yamadutas will begin spawning one at a time.
They will spawn in the main room and then move in a random direction to attack a prisoner.
Follow them in that direction to rescue the prisoner and kill the yamaduta.
The yamadutas are not killable until they have started attacking the prisoner.
If any prisoners die for any reason, you will lose. This includes death by hunger, yamaduta, or yourselves.
After killing all the yamadutas, a final yamaduta will appear in the main room and drop a chest on the floor.
This chest will contain an item unique to the difficulty of the quest you chose.
Caution: a replica of Kalandanda
Bravely: the shield of Shamba