The Avar node has to be earned every time, and it only stands for a minute once you do.
Where it is
Avar Village. The marked map is on the location page: Avar Village.
Getting it
Two ways, and they pull in opposite directions. The peaceful way is to give: drop items inside the offering ground in the middle of the village and their gold value counts toward the god’s favour — 2,000 worth and the good node appears. The other way is to kill Avars in the village. An Avar counts 150, a chieftain 200, a shaman 250, and 2,000 the other way brings up the evil node. Either way it appears in the same place and stands for sixty seconds, then vanishes. The count resets two minutes after that, so you start from nothing next time.
Melding
Stand within three squares of the node and use it. The bond raises your maximum mana by three points plus one for every ten points of Mysticism above five, so between three and eight depending on how mystical you are. You can bond with each node once, and the game will list the ones you hold if you ask.