After reviewing the small amount of data-mined dragonflight content so far, i feel i have a plausible theory on the origins of Galakrond's power.
. So far we have seen 4 Primal proto-drake leaders. One suited each of the typical 4 elements. However we know that "spirit" is the 5th element, consumed by a world-soul during it's development.
. We see hints with the new corrupted treants and guardian models that life/spirit elemental corruption can mimic undeath in a way. Contributing to why Galakrond's ability after consuming his kin seemed linked to necromancy. (The un-living)
. In dawn of the Aspects it is loosely implied that Try had something to do with the corruption of Galakrond. I believe this was not direct but influenced by the Titian watcher forge's created to speed up and cultivate Azeroth's growth. Resulting in the spirit element depleting faster. (This is my most tin-foiled hat point, however it would also loosely explain the Primal flights anonymity towards the Titian flights.)
- Galakrond, linked to the element of spirit and leader of the Primalists.
While mighty, the source of his power was slowly consumed by the titian world soul driving him mad. To maintain his body and power he had to consume his own kin resulting in the events with Tyr and the 5 betrayers who sided with the titans.
We will not see his return, we we learn of his betrayal. The story of the Titian's shaded grey.