Once you enter the crypts you will be overwhelmed as they seem rather complex, but let me assure you the route is really pretty simple. It is mostly a linear path with some treasure chambers that branch off. You can deviate from the main path to loot the antechambers without losing your way.

Later on you will come to a stream without a way to get across. You can continue once you find the switch that controls the bridge.

These caverns are haunted and are populated by Goblin Grenadiers and Demolitions. They throw their explosives in a slow arch so dodge once you see them pull back to throw. Look out though cause they can throw them over walls.

The pendulums you will come up on can also deal out some heavy damage so you will want to time your runs to avoid them. You will be rushed at the halfway point by enemies. Look out in the battle as getting hit backwards could put you into range of the pendulums.

Next you will come up on a stream that will also require hitting a switch to get across. Once you hit the switch you will need to double back to the main path. As you progress through the caverns you will notice that the enemies seem to gather near doors. If you want to avoid death use some defensive magic before you open them.

Next you will need to circle around the large U shaped area to reach the switch that is hidden behind the pendulum. Once you hit the switch the pendulum will freeze and the door will open.

The next switch is directly next to the Automation a sub-boss will activate the bridge to the side chamber. The switch will release the boss and will let you get to the next switch. Keep hitting the switches and crossing the bridges. The Automation is durable but there is not much room on the ledge so keep healing up. The boss is slow so you can dodge most of his attacks but you can duck behind a pillar for a quick rest.

Ehregott the Master Thief is a force that is very mobile and has some pretty powerful attacks. His Automation minions are slow but if you leave them unchecked they can become a bit much. You will be fine if you get rid of them before focusing on the boss.