I wasted 140 tickets (2 attempts) on farming ultimate mats for SLKR.
BUG or WAI: Once your entire team but SLKR is defeated, if Rey has protection from lifeblood, all attacks allow REY to GAIN protection. Even at 500+ siphon and using the event special, you can't break through her protection.
TEAM - SLKR, phasma, Hux, FOO, KRU
Play- SLKR stuns finn. Hux pass tm to slkr who stuns poe. Kill poe. Kill finn. Once both are dead, all damage is increasing Reys protection.