In the RISE OF IRON: PRELUDE (or the reveal trailer if you want to get technical), our 4th favorite fallen, Aksis Archon Prime, makes an appearance in all his spidey glory.
Near the very end of the cinimatic, but before Lord Saladhead charges into battle, you can see quite a few big spidey legs walking away from the wall.
I rewatched it just to make sure it wasn't more peg leg dregs and the design and size of the spidey legs didn't match, let alone the differences in design.
Anyways, thought it was a cool bit of foreshadowing.
Tl:Dr Aksis shows up in the first ROI trailer
Edit 1: https://youtu.be/STB8j9yBeG4
1 minute 17 seconds
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It's a siva version of Skolas on solar burn and light switch. But now Skolas is immune is solar damage