Dried-Up Trenches – Dried-Up Trenches Entrance
To reach this Regen Activation Factor, start at the Dried-Up Trenches Entrance mistle and follow the path leading into the trenches. Take the next two lefts while following the path, and you come to a rock bridge with two enemies on it and wooden crates on the other side. Cross the bridge and pass the crates then take the next right into a small tunnel (housing an enemy) to find a ladder leading to a lower level. Use the ladder and follow the tunnel to find the activation factor in some white grass at the end. There is an enemy patrolling the tunnel.
Cathedral of the Sacred Blood – Cathedral of the Sacred Blood Entrance
From the entrance mistle, head north down the stairway and follow the path until you come to the giant circle platform. Pass straight through the platform and head up the stairs on the other side. At the top of the stairs, take a left followed by an immediate right to find the item in the grass in the circular room at the end of the path.
Ridge of Frozen Souls – Ridge of Frozen Souls Entrance
From the mistle, follow the path forward along the snowy trail up the side of a mountain. When you reach the vehicle sticking out of the ground (first picture above), drop down the hole to the left of the vehicle onto the small platforms to reach the bottom. When you reach the bottom, follow the path to find the item at the end near a gate leading back to the mountainside trail near the mistle.
City of Falling Flame – City of Falling Flame Entrance
From the mistle, head into the city taking the left path and follow the flaming path forward, passing over some magma ground and climbing up a ladder to reach a ledge. Follow the ledge left around a building and take another ladder back down to the flaming ground floor. Pass over some more magma ground and take the first right. Head through the courtyard filled with flaming cars and take a flight of stairs up to a walkway. Follow the walkway taking a left at the end and heading down the ramp. Follow the path forward walking over some more magma ground coming to a ladder. Take the ladder up and follow the path around to another ladder. Descend down it and head forward through the flaming alleyway with lava geysers. After exiting the alleyway, keep going forward under a walkway and take a right through the next area. Follow the path to reach another alleyway containing the item.