I need some advice on where to find the materials and weapons needed for upgrade.

Lightstream execuxion (celestial execuxion, circular amphitrite stone)

Celestial execuxion (profound execution, detonation weapon, clawdem weapon, allure weapon, chalyra weapon)

I have no idea how to get most of the materials.. I have a Profound execuxion +25, so apparently I can get it too celestial execuxion, then upgrade again to lightstream execuxion. Any help is appreciated.