What if I don't have Khravengger?
Don't play Last Rite.
Your damage will suffer, a LOT. Use
Sundered Prince or
Seeker of Dark Lung as a placeholder, but really, if you like playing Last Rite, get
Khravengger. It's a massive gap compared to any other weapon (as of 1.1).
Can I replace X with someone else?
Xaihi: Unreplaceable. Wherever there's a Cryo DPS, she will be there. Her buffs are just too strong for you to not use her.
Ardelia: Easily replaceable as rotations can feel a bit clunky due to the nature of Last Rite gameplay/rotations. Sustain is just for comfort and if you don't feel you need it, Ardelia value drops significantly.
Perlica: She's good, easy to play, won't accidentally consume your Cryo stacks and has zero SP cost. Recommended to use, but unlike Xaihi, she's replaceable.
Gilberta: While she's great for grouping enemies and applies a lot of Susceptibility on enemies, Gilberta can destroy your Cryo stacks with a bad rotation. Furthermore, Last Rite already applies Susceptibility, lowering a bit of Gilberta's value. This can get even worse if Tangtang is on the team, as she's another source of Susceptibility on enemies. Recommended over Ardelia.
Tangtang: If you have her signature (
Brigand's Calling), she's unreplaceable. Otherwise she's just "fine". More Cryo Inflictions is good and can smooth your rotations a bit.