A tree guarded by the Pryeosian Clergy, this ancient massive tree is a holy site to them. It is often a public site of worship & ritual. Whilst the clergy make it illegal to do such.. juvenile things as climbing the tree, this is actually a facade to keep at bay the truth that this tree is actually alive with high planar magics. As it stands, this oak is one of many ley line crossings which can allow for planar and extraplanar travel. The clergy keep it safe and use it as a way of traveling quickly throughout Estoenia and even for secretive missions beyond the nation's borders.
Rarely, especially in times of danger, the tree is used as a rallying point to summon angelic beings to fight the wars of the church. Such an incident has not been recorded in nary a couple centuries, now.