Terric is an extremely powerful Legacy which allows the user to release seismic waves. With training this Legacy can be used to produce accurate and controlled earthquakes.
One develops this Legacy when Hilde is killed by Mogadorians. She is angered and stamps her feet which triggers the earthquake, killing many oncoming Mogadorians. The Legacy could also open up the earth and swallow Mogadorians. The Legacy had only just shown itself and was not nearly as developed as it could have been. One soon becomes exhausted from using it and is soon overwhelmed by Mogadorians and killed.
Adam gains the Legacy when he wires his brain up to One's body in a desperate attempt to save her mind in his. He sees the vision of One gaining her Legacy and, whilst unconscious, he inadvertently uses it causing an earthquake at Ashwood Estates. Adamus later trains to develop it with the help of Malcolm Goode and is eventually able to aim and vary the intensity of the earthquakes. In New Mexico, Adamus uses the Legacy to destroy the Dulce Base armory, causing an explosion that destroys most or all of the base and killing all present Mogadorians including his adopted brother Ivanick Shu-Ra.
Those with the title of Pittacus have the Legacy Ximic which allows them to replicate Legacies that they have seen.