Gravis landed on top of the Spire. After that, his two other bodies transformed into lightning and got absorbed by him. The beasts were shocked when they saw that since this seemed way too magical. After that, he simply told Orthar that he should explain it to the Tribe. After all, Gravis needed to regenerate his wasted Spirit and Lightning and then go back to smithing and watching the CMO.
The upper echelon immediately wanted to ask Gravis about his technique, but he just directed them to Orthar. After a lot of explaining, Orthar managed to rudimentarily describe the technique that Gravis was using. When they heard that Gravis could actually transform into lighting, they were, again, surprised to no end.