Diablo II/Search for Cain

The third quest from the Rogues is given to you by Akara after killing Blood Raven. She explains to you the magnitude of evil which you are facing in your journey and suggests that a Horadric Mage, named Deckard Cain would prove to be a powerful ally. Akara believes that Cain resides in Tristram, and that the quickest way to the city is through the use of the Cairn Stones in the Stony Field.

Akara will send you off to the Dark Wood to find the Tree of Inifuss which holds the answer to the Cairn Stones. First off, head to the Stony Field, you should find the Cairn Stones there but do not approach it yet, ignore it and continue to find a cave called The Underground Passage Level 1. You will find considerably stronger monsters in there particularly more corrupted rogues. Once you pass through the area, you'll find yourself in the Dark Wood.

The Dark Wood
The Tree of Inifuss is fairly hard to find considering Dark Wood is a pretty big area. You'll know when you find it if you bump into a unique monster called Treehead Woodfist (a Wendigo) followed by two of his minions, kill them if you can and speak to the tree in order for it to drop the scroll. Once you obtained the scroll, you can either use a town return scroll or the Waypoint here to return to the Rogue Encampment. Speak to Akara there to receive further instructions. Be careful, if you have not activated the waypoint, you will have to travel underground again to get back.

Tristram
Akara will tell you to read the runes on the scroll. Do so by right clicking on the scroll and you'll realise numbers would appear on the stones in the scroll. If you've seen the Cairn Stones in the Stony Field, go there now. If not then explore around untl you find stone like structures on your map. Be careful when approaching the Cairn Stones because another Super Unique Monster will fight you. It is Rakanishu which is a lightning enchanted carver, it's shock web attack is not laughable as it hits fairly hard if you do not have high resistance. Once you defeat Rakanishu, talk to the stones by clicking on them in a specific order as shown on the scroll and a red portal would appear taking you to Tristram.

Once you enter Tristram, you'll realise that the whole town has been obliterated and is currently being occupied by undead. Stay away from the dead cows in the area unless you don't mind taking damage. Deckard Cain is right in the middle of town, simply talk to the cage to free him but be mindful of the monsters around you namely the three super unique monsters. Remember Diablo I? Well you might find ome familiar faces here, it seems that the blacksmith Griswold has succumbed to the evil much like Blood Raven had. Well to make things short, Griswold has enhanced strength and has a ridiculously high stamina to boot. Take him down for good item drops and to prevent him interfering with your mission, it may take a while however. Once you've taken down everything here, you might want to find Wirt who apparently is killed in the attack. Talk to the corpse to receive lots of gold and his legs which acts as an ordinary club. Keep this item until the end of the game to find an interesting little secret.