Hey is there any way to spawn in a second magma orb because no matter what I do the golem wont respawn
If you systematically developed skills and relationships, and also completed other quests, then the second golem will appear in the same place the next day. You can also try talking to the Dwarf King and the guys guarding the exit from the dwarven city.
When I went through this stage, Celica talked to those guys, the king, and then she went to bed. And in the morning she returned to the temple and the second golem was already available there.