How to change the colour of Dithmenos' umbra tiles?

Recently I started a char worshipping Dith. The purple aura is a bit too dark for my eyes, I’d like another colour. I had a look at

but couldn’t find what to set in my rc-file. What do I have to do?

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I don’t know a good way to do this, but as a last resort you could edit the file dat/tiles/feat.png. The umbra is generated with 4 tiles, located after the blood and the halo.


The change I made produces funny results.


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