Calamity Infernum (Catalyst Mod) - Astrageldon - Summoner

I LOVE this boss fight. For those that don't know, Astrageldon is a boss the existed in earlier versions of Calamity mod, but was removed. They made it into its own mod (Catalyst mod) and completely revamped the fight.
Normally once you beat phase 1, you can just spawn it at phase 2 if you die, but I wanted to show of the full fight!