After you reach the locked gate, jump towards the, barely visible, interactive edge on the left.
Then, jump towards another edge and leap towards the catch shown in the above screenshot.
After you reach the catch mentioned above, this will unlock a blue object above the locked gate.
Switch to the other wizard and use his staff to shoot a magic projectile and unlock the passage.
Walk into the next location in the tomb.
The camera view will change here to the third-person perspective.
There is an easy way to leave the sarcophagus chamber, i.e.
Climb down the stairs and go ahead.
Stop after you reach a much larger gate.
You will have to solve a simple puzzle here.
Start by switching to Radagast and healing the bat.
First, fire at targets1,2,3and4(the above screenshot), and then at targets4,2,1and3.
If you make a mistake, you will have to repeat only the last part of the puzzle.
Completing it, will gain you access to the next part of the tomb.
Note- while solving the puzzle, aim manually, i.e.
hold down the action key/button!
Go ahead, destroy the successive interactive objects.
Stand on the plate and, after another blue element is revealed, fire a magic projectile at it.
Destroy the objects here and hold down the building key/button to build a ladder.
Climb up the ladder, to the upper ledge.
Jump down and stand at the locked gate.
Look up here and use the staff to fire at the big blue object, located above the gate.
Wait for the passage to unlock and go ahead.
After you get at the chasm, shimmy along the edge carefully.
Stop after you find a big blue padlock.
As you probably figured out, you should probably use the staff.
After the successful attack, jump down to a lower level and go left.
This will allow your character avoid falling into the chasm.
Keep using the narrow edges until you reach the last locked gate.
This being done, stand at the gate and fire a projectile towards the blue object above it.

This is the end of this long journey across the tomb.
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