The Altar of Rites is found in Act I, in New Tristram. From the town \r waypoint, head left near Tyrael, follow the road down past Arghus the \r Collector, and you will run into the Altar right before you descend to the \r lower area where Radek the Fence is. The Altar's location is also marked on the \r minimap with a massive, golden circular icon.\r \r