User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-76.109.26.131-20150308013516/@comment-1359322-20150308030131

Where did you get the idea that Indra is arrogant. Of course he has his arrogance, his the King of the Hindu Gods, even Odin has his arrogance as well. But by no means is Indra arrogant to the point where he can't differentiate the level of strength between him and his enemy. If Indra was plainly arrogant, he wouldn't have tried to gather allies to help him fight Shiva whom he can't beat.

From my POV, Indra is probably either scared or jealous of Shiva. Indra despite being the King of Gods of the Hindu Religion, faces an issue where there's another God way more powerful than him. If Shiva decides to suddenly revolt against him, Indra probably would lose badly, so Indra decides to use all underhanded means to obtain more power in the form of powerful allies.