The ramp is the hard bit. It sounds like you just need 2 change the party. Visas is a great choice :joy: , but instead of brianna, you want to have mandalore, and either mira, or any other jedi who has steathrun and repair e.g atton. Youu could also use a workbench before the level, and give the characters armor the bio-restoritive underlay, if you have it. Or you could just use force speed and stealth run and run for it into the tomb.
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I used Visas, the Handmaiden and Mandalore (with two-weapon fighting and Master Power Strike). So it was a melee-party. Just walk up to all those blaster-wielding Sith and hack them apart. Since Visas and Handmaiden were Jedi in my game, I could use them to heal