I have not seen much discussion about this topic yet, and if there is, apologies in advance.
When we reach Dragonscale Expedition Renown 24, there is an interesting questline in which we can visit some of Tyr's facilities, in which he was experimenting with Proto-Dragons and their easiness to be infused with every element. So this is, IMO, a clear indication that he created the Primal Incarnates, which are:
- Raszageth (infused with AIR).
- Fyrakk (infused with FIRE).
- Vyranoth (infused with WATER).
- Iridikron (infused with EARTH).
If we look at WoW's famous Cosmology Chart, we can see that Tyr infused Proto-Dragons with every element in the middle of the chart, except for:
- SPIRIT, because our planet does not have that element, as it was consumed by Azeroth herself, the Titan, if I recall correctly.
- DECAY. But DECAY was actually infused into a Proto Dragon. That would be Galakrond.
Galakrond was too much, one of Tyr's experiments which went south. Why would he appear in that time of need to help the Aspects? Just when Galakrond was a threath? He messed up and he needed help to set things right. Or did he? Maybe it was just another experiment. We do not know if the Primal Incarnates were created after or before the Aspects. Why the Primal Incarnates did not help the Aspects against Galakrond if they existed at that point? Maybe Tyr wanted to try how powerful his new Proto Infused Dragons would be, but this time, he will infuse them with more complicated forces, not with the basics elements of every planet:
- Alextrasza (infused with LIFE).
- Ysera (infused with NATURE).
- Malygos (infused with ARCANE).
- Nozdormu (infused with ORDER).
If we look again to WoW's cosmology chart, we can see that these new elements belong to the outer rings in the left side, but the ones in the right, top and bottom side are missing. Lets take a look at them:
- FEL and DISORDER. Tyr did not have access to these elements, as the Burning Legion did not have invaded Azeroth yet at that point.
- NECROMANTIC and DEATH. Tyr infused Galakrond with DECAY, and as he became an enormous threat, he probably decided to stop right there.
- SHADOW and VOID. Was Neltharion the Earth-Warder? No, he was not. Tyr already infused Iridikron with EARTH. Why he would infuse another Proto-Dragon with the same element? He infused Neltharion with SHADOW or VOID. That is why he was the first to fall. That is why maybe he started to see all paths as a Void infused being, and saw that the path set by the Titans was not the right path.
- HOLY and LIGHT. It is unknown if Tyr had access to these elements when he created the Aspects. He had access to VOID because of the existence of Old Gods in Azeroth, but we do not know exactly how he would find a light source to infuse a Proto Dragon. But, maybe he did. In the Dragonscale Expedition's quest mentioned above, we also discover that Alextrasza and Ysera, who are sisters, had a brother. We are told that he died, but did he? His body has not been found. Maybe he is the LIGHT infused Proto-Dragon, which is locked somewhere.
So, IMO, Tyr is even worse than Odyn. He does not give a shit about the mortal races, and every good action that he made was probably just to clean his own messes. I bet that his plan was to start the Dragon Wars just to see which element was the stronger.