However “blotched with lichens” is a nice detail that is both literally true (the pillars are rough stone in a wet, outdoors environment so they are collecting lichen—it’s no big deal, perfectly natural) but is also suggestive of damp, decay, aging, necrosis… and eventually death. So gothic!
So let’s take the chance to learn some good death-and-decay-laden gothic words.
To the thesaurus! Here are some starting points, but feel free to roam further:
http://thesaurus.com/browse/blotch
http://thesaurus.com/browse/decay
Find some words you like and make a gothic-sounding adjectival clause like this one:
…blotched with lichens…
…action preposition thing…