To collect keys to enter the stronghold in Hail to the King in Dwarves Favour when you get to the locked door go down the right path first. When you get to the locked door with runes on it pick up a pink spiky ball from the trunk near the door and throw it at top of the left gong:
Use a lightning arrow to explode it and another arrow to explode the pink spikes near the right gong. Make your way through the gate and follow the path. Use the axe to lower the bridge and keep following the path:
Pick up the key off the podium and return to the locked door.
This time follow the left path until you get get to a locked door with a winds of hell sphere in it. Drop down and throw the axe at the white disc below the wheel on the cliff:
Go back below the locked winds of hel door and pick up the crystal when it arrives. Carry the crystal to the area below where you crept across the ledge before and place it into the socket. Use an ice arrow to activate the bridge:
Go back around to the pillar with the winds of hel:
Take the winds of hel and make your way up the slope and across the bridge and put the winds of hel into the pillar ahead. Go past the pillar, take the winds again and transfer them to the locked door. Follow the path and collect the last key.