This is the best route to Inferno Redeemed temple:
- Exit garden to Inferno Frontier
- Head NW across the mass of buildings/ruins and find yourself on a path leading N/NW.
- Follow this path through the guarded gate
- Keep watching the cliff wall to your left, look for a small opening that leads to an area of ancient machines and structures.
- Pass through this area and head toward the marked static dungeon (blue square)
- Climb up the cliff wall above the dungeon entrance
- Follow the small valley NE, you will soon see the outskirts of the temple.
- Go around the main structure to the N side of it, and jump up to the bridge by the entrance. This might not be doable if you're lowish level, as nanomage I had no trouble at 208 with maxed abilities and runspeed.