Board Thread:False Info and Speculative Discussion/@comment-4295751-20150721082103/@comment-203.214.123.86-20150721101210

It was a sacred Druid site. It heavily featured in season 3A and 3B. Fair to say we are going to learn much more too in Season 5.

Derek killing Paige in the 3A flashback episode gave some life back to the Nemeton which enabled it to save Jennifer Blake. The surrogate sacrifices of Scott, Stiles and Allison (also involving Deaton, Lydia and Isaac) to find their parents gave even more life back to the nemeton - enough to re-awaken the Nogitsune and make Beacon Hills become a "beacon" for supernatural creatures.

As Stiles said, everything that has happened since episode 3.11/3.12 is all on the pack really - the power given back to the Nemeton caused it all.