A short door riddle

You and Eclipse walk in, You are met by the people on the signs in person. Void and the nameless guy, they speak, " Hh_eEy TherreE Palll I'_Ims oo Gladd YoUU mAdee ITT, Icc ouln_t cONataAin mYaExxItnMnEnt! * I'm glad you made it here too, Now here's your options, You can go through this portal and complete this section, you could also go up this staircase if you think you missed something although I'd doubt that, Or you could just stay here with us* S_Oo WhaAT IWll ITt Be_E PalAA_L?"
Go?
Stairs?
Stay?

You have 3 choices: