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The Crystal of Arxia is a First Ones' artifact where Mara and her allies stored the failsafe code for the Heart of Etheria. The crystal was strong and powerful to be enough to hold all the powerful magic that the failsafe possessed. It was shown in “Failsafe”, the eleventh episode of Season Five, hidden beneath the citadel where Mystacor was later constructed.
It is said that the power it possessed is the power of the heart of Etheria and that if a person enters the crystal, they will possess all the power of the crystal and carry it in their body, possibly dying in the process. Even if they survived this, use of the failsafe would likely kill the person that carries it. However, only She-Ra could survive it. Adora went inside the crystal to obtain the Failsafe in the episode of the same name.