Taken from the Diablo Wiki:
Cooldown: 5 seconds
Release a wave of pure energy dealing 115% weapon damage as Arcane to all nearby enemies.
Strike the ground in front of you, causing 250% weapon damage as Arcane to enemies in the area.
Thrust a beam of pure energy forward dealing 300% weapon damage as Arcane.
The following abilities are unlocked with the skill's runes, so the player has to choose which one to use:
Slow Time (20 seconds cooldown)
Project a bubble of warped space and time that moves with you, slowing the movement and attack speed of enemies by 40% and the speed of projectiles by 60% for 10 seconds
Teleport (10 seconds cooldown)
Teleport through the ether to the selected location up to 20 yards away.
All of the Archon's skills completely replace your wizard abilities, until you revert to your normal form, either by waiting or right-clicking on the buff above the hotbar.