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All Skyfathers tap into a personal source of mystical/cosmical energies.
King Thor with Odin Force and Asgardian Runes was above any Marvel Skyfather.
Heralds tap into the Power Cosmic.
Thanos tap into a dark, evil version of it.
The amount of energies they can handle depends on experience, will power, and durability, there's certainly a limit, and the highest limit is that of the skyfathers.
Obviously Celestials, Big G and Abstracts are out of question cause they are another league, totally.