Lower Cave in Bog ?

[Gimpster]

Hello can someone help

I stuck trying to open the door in the lower cave in the Bog. I have done Runemaster and the nasty room with all the baddies.

But how do I get last door open ???

Thanks
Gimpy xx

[Gimpster]

Don't worry found it lol.

SpoilerShow

There is a button next to door