I prefer lethal Pantheon 100x more than bruiser/tank. Especially after Sundered nerfs incoming.
The damage is just too good and I can take out people in fights a lot easier. The poke damage is strong if throwing Q and you get ult up so fast for ganks. I play this build for everything except top/into a team of like 3 tanks. Even against tanks its pretty strong. The whole build revolves around health% damage chunking.
I go Volt->bork/axiom->bork/axiom-> grudge->eclipse/edge of night/fill like serpents-> fill/armor pen
But 19/20 games its just volt->bork->axiom->grudge->deaths dance or eclipse and this melts even tanks. You are squishy which is a downside but you can easily punish anyone out of place like any assassin and you can constantly push objectives or fights with ult. Idk i prefer this way more
Runes: press the attack with triumph, haste, and coup de grace. Secondary runes: domination with either cheap shot or sudden impact, and ultimate hunter.
(I should try bastion breaker idk how i havent thought of this) edit: bastion break def very good for the build. Would take it as a first/last item unless you dont care for ults and take it over axiom. But bork second def feels the best