Excalibur is an endgame frame. Work on your mods. I use rhino for almost 50% of my gameplay, he comes from one of the first few planets so he’s great to get. His iron skin makes you genuinely invincible at lower levels, and if it goes away, you can just recast it. It also scales very well up to about level 70-80 depending on your build. Great for credit farming on the Index, and for MR farming he makes it so you never have to worry about dying and losing affinity. My favorite frame though is Mesa. Peacemaker is such a fun ability.