User blog comment:Adamjensen2030/Character's profiles IMO/@comment-30294856-20170319202626/@comment-30294856-20170320014030

Bowser actually survived the destruction of the universe in Super Mario Galaxy WITHOUT a Grand Star. Mario should get that durability feat since he was able to harm Bowser in that game and tank hits from him. He also has survived hits from Culex who is implied to have some control over space and time, so that is a probable Low 2-C feat.

Luigi's feat was with the Poltergust 5000, so it should be separate from his main feats. With it, he closed the Paranormal Portal. Hadn't it been closed, then the entire Mario universe, it's contents and it's spacetime would've been shattered. That's why Luigi with the Poltergust is Low 2-C.