How did you get here? From somewhere in [CELIA - F PATH]
"After you managed to get some light the huge pipe ends at a platform."
You stand at a platform with a huge grate blocking your way. There is a carving on the wall, which you can click on to take a closer look at. It seems that you need to enter a 5-digit number in order to continue.
Taking a look at the source code, you will notice that a specific word needs to be converted into numbers. The carving tells you how to convert the word, though some maths is required. A tip to make it easier for yourself: start with E x V x E = 2, in order to solve for those two letters. Every letter must be a whole number, so there is no need to search for any complicated solutions.
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“The word you need to convert is avast(.jpg). If E = 1, V = 2.... you should be able to find the rest.”
Remember to refer to the posts in Getting Started if you need some general tips.