Favourite specialised builds

What are your favourite specialised builds? Builds that excel at a certain type of content and generally work across leagues.

Building around what you farm is one of the best approaches in my opinion and I’m curious what build/farm combos people like.

In particular I’d be really curious what people find excels at farming the Feared.

As for me, I’m a huge fan of the CWS ultimatum farming build that popped up last league.