Volcanic Fissure and Chieftain Scaling

If Zerker its the rage 4pter, aspect of carnage and the warcries exert node, Slayer has quite a few options depending on what aspect you want to push over the others.

Temjin has covered most of the issues in depth really, and yeah explosive trap has been nuts for ages its one of those under the radar OP skills that somehow avoided detection for years. I use it whenever I get frustrated about bossing but it has all the OP scaling vectors

Phys converted to X (so at least partial hatred)
Extra hits with gem level
Extra hits with helm enchant
Lovely trap scaling
Better aoe/single target dependant on setup.

Definitely a good skill to choose to clear the game with, only negative for me is its visually very busy but with the dps it hardly matters.