Cairn Stones

From Diablo Wiki

The Cairn Stones are a mysterious circle of stones located in Stony Field. Five standing stones make up the circle, each marked with a glyph that must be touched in a particular order to activate the stone. A sixth stone sits apart from the rest, unmarked. A Super Unique Carver named Rakanishu also guards these stones.

The player will be required to visit these stones during the Search for Cain quest. Once activated, the circle of stones will open a portal to Tristram, where the player must find and rescue Deckard Cain.