3.7 –Reach Catacombs via Palace Ruins-
 
Go to the icon and grind up the rail that stretches across the bridges 
and the water. Go down the path and watch the scene. Fight the enemies 
and continue where all the enemies are. Continue and you can charge at 
the Dark Eco Vent. Use Dark Strike (turn Dark Jak and press R1) on the 
cracked wall. Follow the path and charge at one of the Light Eco Vents. 
Use Light Jak Flight to get across the gap. Follow the path and charge 
at the next Light Eco Vent. Continue. Kill the enemies and charge at 
the Dark Eco Vent. Go to the cracked wall and use Dark Strike. Continue 
and jump down the platforms (be careful because they crumble). Go down 
the path killing any enemies. Grind on the rail to go over the gap. 
Grind across the next gap and jump over a small gap to reach the next 
rail. Follow the path and jump across the crumble platforms. Charge at 
the Dark Eco Vent. Find the cracked wall and use Dark Strike. Continue. 
Grind across the rail, which is hard to see, and jump over the gaps in 
the rail. Grind across another hard to see rail, jumping over another 
gap. Continue and jump up to the ledge using the crumble platforms. 
Yes, you have to go further. Charge at the Dark Eco Vent, find the 
cracked wall, and use Dark Strike. Walk forward for a scene.