heres new s6 tank build 
+
+
+
+
or
+
more they attack you more you heal and do damage works super well with rammus good with garen, nasus, renekton, poppy, etc. who has self defense buffs... use this build when enemy has lots of ad and u can just stand there and kill enemy adc.
ModWulf Helhammer1 votesWhy the gun blade?
And also merc treads are probably better except if the enemy team is 100%AD (even then it might still be better)
gochu bot1 votes gunblade has 15% heal from EVERY damage so thornmail damage reflect and sunfire will heal you and spirit visage increases healing effect plus magic resist for enemy mage since there will be atleast one ap in enemy team
gochu bot1 votesespecially for rammus his w increases his defense and reflects damage it will heal more and as much as they attack you they will lose their health and taunt will make them attack you even they dont want to
gochu bot1 votesgunblade is still good since many tanks has ap ratio skills and gunblade has ad and ap