In Morrowind, the Atronach sign was great because you could easily recharge by summoning a ghost and punching it until it used some Drain spells on you, which refilled a ton of Magicka. Is there any similar tactic in this game, or do Atronachs basically have to carry around potions/welkynd stones or find Ayleid wells?
Say, can you hear that? It's the sound of the Reaper...
Having active Spell Absorption effects can block the use of a Telekinesis spell. Because spell absorption returns the base cost of a spell, absorbing a Telekinesis spell at Mysticism levels above 33 will actually cause an increase in Magicka. Absorbing at 100 Mysticism returns 5 times the nominal cost, so this is an effective way for Atronach-birthsign characters to regain Magicka.
Not sure if it's still present, but I remember reading that atronoch characters could stand infront of the people casting in mage related buildings(guild/university). Refering to the people who send random spells towards metal plates for training. They apparently don't stop and you'll absorb the magicka while standing in their path.