Durability Negation through Phasing with a Void Magic sword, essentially what his kit is centered around.
Warframes can be modified to have increased range with their abilities, efficiency, duration and strength. Increases to their armor, natural durability/HP, and shielding can also be increased along with mods like Adaptation to bolster resistances to a type of damage after being exposed to it.
There's stuff like Rolling Guard which grants limited Invulnerability, Quick Thinking which I mentioned before which can be contrasted with Health Damage granting Energy through Rage.
Weapons can be modified much the same, increased damage, increased projectile speed, increased chance to deal critical damage, etc. Elements can be added like Heat, Electricity, Toxin, and Cold, these can be combined as well for things like Radiation, Corrosive, Viral, and Magnetic.
There are gear items like Specters that can effectively serve as duplication but can be used for other frames as well, so despite using Excalibur this would still open up said Specter to be, say, someone like Volt, who has a speed amp or Mag, who uses magnetism and so on.
There's also a lot more stuff like Synthesis Scanners but even I doubt something like that would be mentioned.