Epoch

One cannot "wish" for Epoch to be triggered directly. Epoch can only be triggered through the consequence of a wish spell. If put into an unconscious state, Epoch is triggered. If killed, Epoch is triggered.

If unconscious you gain the ability to glean in to the past or future on an unfathomable time scale.  You may extract any sort of information from any given year. You may choose to live as a person for any given year, you may choose to simply watch a location for any given year. Time flows differently in this state and you are able to spectate a year within one turn or 5-6 seconds. Any spell hindering the senses will not effect you in this state. For example, if you choose to see through the eyes of a warrior for a year, you will be able to hear though the spell "silence", while this warrior will not as that would directly impact the flow of time. You cannot interact or change the future or past though any means. For each year you choose to keep this spell active you must perform an intelligence saving throw.  

If killed, time itself is laid out before you. Without being able to glean information from any specific time period, you must use your current knowledge to reincarnate at any desired point in time. reincarnating into a past version of yourself will make you invulnerable to wish spells. Wish spells cannot effect you you in any way. However you will be unable to cast epoch ever again, you loose a 7th level spell slot permanently. You may not reincarnate into someone you know. You may not reincarnate into someone that has any connection to you or your past life. You must choose to leave it behind. You may not reincarnate as a god. You may not reincarnate as a DM. Your DM may permit this however and lay out more rules for reincarnation.