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You can contact the energy again when you lead the crusade army into the world wound for the first time. Available at Mythic Rank 3
Demon: In Shield Maze, near the exit where the cultists and kidnapped mongrels are. Angel: In the underground ruins, where you first met Lann and Wenduag. Their energies can be found in the following Location: In order to unlock these Mythic Paths, you need to have contact with their energies first, then you can pick them after you liberate the Gray Garrison.
Relationships with your Companions, who are helping you by being your councilors in the Crusade, will be affected as well.
Your Mythic Path will also have a great influence on the Crusade Army, depending on your actions and alignment, some allies might join or leave the Crusade, triggering various outcomes later in the game. After you reach around rank 8 in Mythic path, there will be a quest for you to re-do your choices and unlock some late game path (Gold Dragon, etc.) and other mythic path mechanisms. Note that some Companions may not like your drastic alignment shift, and decide to leave the party in that case. You can still use the powers you already have, but may fail the mythic quests that provide further mythic progress. After you picked one path, there will be a quest to ask you to realign yourself if you don't meet the requirement. Mythic Paths have soft alignment restrictions. (Unless you pick the Trickster ability that allows your Companions to share some of your power.)
Companions only get general mythic abilities and feats.
Only the main character can choose a Mythic Path. Mythic levels only upgrade in certain main Quests, and are tied to story progression instead of general Experience points. You can still reach level 20 of your ordinary class while having mythic levels. The mythic levels do not mix with your ordinary character levels. Note that when picking different Mythic Paths options in dialogues or storyboards, you are NOT locking yourself into a certain Mythic Path. This will only happen at Mythic Rank level 3, when you have to actively choose between the ones you have at your disposal.
So pick that option whenever available in a dialogue or interaction, if you want to have that Mythic Path at your disposal when you reach Mythic Rank level 3. Which it actually means is "unlocks" more than "requires".
Although it may be confusing at first, when you are having a conversation or interacting with something in-game and an option that says "Requires xxx Mythic Path" appears. Each path represents a journey into legend, and each tier in that path grants abilities and features related to that pursuit.
There are 10 mythic paths in Pathfinder: Wrath of the Righteous.