Phase 1: Scythe Dance
The Successor of the Ribcage is a fast and agile boss, wielding a large scythe. Her attacks are quick, often coming in multi-hit combos. She has a forward dash attack, a spinning scythe attack, and a ranged blood projectile. The best strategy is to learn her combo timings and dodge through them, then counter-attack during her brief recovery. If you're proficient at parrying, her melee attacks are parryable, opening her up for a critical hit. Keep your companion close for support and healing. Avoid getting caught in her longer combos, as they can quickly deplete your health.
Phase 2: Blood Frenzy
Upon reaching approximately 50% health, the Successor of the Ribcage gains new blood-based attacks. She will frequently use a powerful blood explosion around herself, a blood wave projectile, and can summon blood pillars. Staying at mid-range can be dangerous due to her projectiles. Consider staying close, but be ready to dodge her blood explosion. Her attacks become more erratic and faster. Using a Blood Veil with high blood resistance can mitigate some damage. Gifts that provide quick mobility like 'Shift' or 'Haste' can be very useful for evading her new attacks. Rewards: Isis Blood Code, Successor of the Ribcage's Vestige A.