From Ars Magica
Archmage armor is the most advanced of the Ars Magica armors. It offers physical protection equivalent to Diamond Armor, and superior protection against magical damage.
Archmage Armor offers the following additional effects:
The headpiece is woven with powerful water and air magics that will protect the wearer from drowning. When your breath underwater reaches three bubbles remaining, the headpiece will cast Water Breathing (buff) on you, with the highest magnitude. The water breathing effect will last for 45 seconds. The helmet has a cooldown of 50 seconds before it can protect its wearer again. If you already have Water Breathing (buff) active, regardless of magnitude, the armor will do nothing until it runs out.
The chest has powerful life magics on it that will attempt to protect the wearer from death. At 2.5 hearts, it will cast Regeneration (buff) on you, with the highest magnitude. The regeneration effect will last for 12 seconds. The chest piece has a cooldown of 60 seconds before it can protect you again. If you already have Regeneration (buff) on you regardless of magnitude, the armor will do nothing until it runs out.
Additionally, the chest piece will cast an augmented heal spell on you in the event that you are about to die, however, the cost to the armor is significant, costing 75% of the armor's magic. If there is not enough magic left in the armor at that point, it will be unable to save you.
This is the thing that I get saved by a lot! The legs are fortified with powerful fire and water magics that will protect the wearer from fire or lava. If the wearer is on fire, the leggings will cast a short duration Water Shield (buff) (1 second duration) that will put them out. If the wearer is in lava, the leggings will cast a longer lasting Water Shield (buff) (15 second duration) on the caster to give them a chance to protect themselves. This is a much higher cost to the armor, and will cost more of its available reserves. Either effect has a cooldown of 30 seconds. In either case, if you already have Water Shield (buff) on you regardless of magnitude, the armor will do nothing and save its mana.
The boots are woven with powerful air magics that protect the wearer from falling. They will let you fall at full speed until right before you hit the ground, then will quickly slow your fall. They can only sustain the slow for a brief second, and if you pass the ledge to continue falling, they will be unable to protect you.
If you are not falling far enough to take damage or are otherwise protected from falling, the boots will conserve their mana and do nothing.
The fall protection has a 10 second cooldown.