1.) Yes a sith needs to die before they reconsistute. Until they die they cannot reform.
2.) Yes. Just like Raschel has armor for her tail.
"Dulce bellum inexpertis."
Official Forum Expert on Norse Mythology
As Odin says in the Hovamal:
"Praise no day 'til evening; no wife 'til on her pyre; no sword 'til tested;
no maid 'til bedded; no ice 'til crossed;
no ale 'til drunk."