Sanctuary Temple
Before heading toward the next upgrade, there are still still a couple more expansions to get. If you're entering Sanctuary Temple from the main entrance these will be right on your way, but if you're coming from Agon, as we left off on the last page, you'll have to backtrack a bit. If so, head back through the Reactor Core, save if you want, and continue back to Sanctuary Entrance. There is an Ingsmasher waiting for you in the Power Junction, but that fight will occur whether on your way out or on your way in. Now that you have both Burst weapons, the Ingsmasher should be no problem provided you use the right attack at the right time.
Sanctuary Entrance
Look for a cracked window to the left of the door to the Power Junction and break it with a Power Bomb. Go inside, step into the lift, and scan the panel on the upper floor; this activates an Orb Cannon. Take the lift back down an use the cannon to be shot to a platform in the middle of the chasm.
There are two Spider Ball tracks, one going up and one going down, leading from the little terrace you find yourself on. Start by Spidering up to the top of the platform where you'll find a cannon similar to the ones in the Central Mining Station back in Agon. Before using it though, take a look around to see what you're going to be shooting at. Switch to Scan and locate the weak section of rock near the top of the cliff face above the door leading back to Temple Grounds. (They are to far to actually scan from here but they should glow in the scanner.) Second find a stack of giant crates in a similar position on the opposite side of the chasm. The third target is easy to miss; it's a weak section of rock below and to the right of second target, sticking out from the side of the Temple. Get into the turret and fire at the three targets, it should only take one shot each.
Spider back to the balcony and down again to a second orb cannon which fires you to the room where the lift took you earlier. Take the lift down again and go to the right of the Sanctuary door. Scale the ledges to find a hologram to scan and a Spiderball track uncovered when you blasted the rocks. Follow the Spiderball track to the top, scan the Luminoth there, then roll into another Orb Cannon to be shot clear across the chasm to a ledge in the cliff. Pick up the Power Bomb Expansion here. Getting down from here is a bit scary, but you should be fine if you just drop off the edge.