The Heroes Reborn Armor..
During the Onslaught event, Tony Stark was one of the heroes who sacrificed himself to defeat the menace, and consequently was shunted into a newly-created pocket universe by Franklin Richards. In this Universe, Tony had a different history, and modeled a different suit of Armor.
This armor was composed of Promethium, making it nigh-indestructible [even to the likes of the Hulk]:
======
Had underwater capabilities, and a tractor beam:
======
H/R Iron Man vs. H/R Hulk [Tony ends up ko'ing the brute with one hand blast]: