Rebecca Ascension Materials & Farming Guide

To fully ascend Rebecca to Lv. 90 and max out the forte board you need 60 Past Reveries, 46 Nightmare Flashdrive, 26 We Who Question (weekly boss), plus the enemy and forgery series below: 2,200,000 Shell Credits in total (170,000 + 2,030,000).

At a glance

Material	Total
LF Mech Core	29
MF Mech Core	40
HF Mech Core	52
FF Mech Core	61
We Who Question	26
Nightmare Flashdrive	46
Past Reveries	60
Incomplete Combustor	25
Aftertune Combustor	28
Remnant Combustor	55
Reverb Combustor	67
Shell Credit	2,200,000

Rebecca ascension materials

Ascension moves Rebecca from level 20 to 90 in six breaches. Every row is the cost of one breach:

Level	Shell Credits	Materials
20 → 40	5,000	LF Mech Core ×4
40 → 50	10,000	Nightmare Flashdrive ×3 Past Reveries ×4 MF Mech Core ×4
50 → 60	15,000	Nightmare Flashdrive ×6 Past Reveries ×8 MF Mech Core ×8
60 → 70	20,000	Nightmare Flashdrive ×9 Past Reveries ×12 HF Mech Core ×4
70 → 80	40,000	Nightmare Flashdrive ×12 Past Reveries ×16 HF Mech Core ×8
80 → 90	80,000	Nightmare Flashdrive ×16 Past Reveries ×20 FF Mech Core ×4
Total	170,000	every material, once each (table below)

Total rebecca ascension materials

Material	Total
LF Mech Core	4
MF Mech Core	12
HF Mech Core	12
FF Mech Core	4
Nightmare Flashdrive	46
Past Reveries	60
Shell Credit	170,000

Rebecca forte materials

The forte board is five main nodes (each leveling 1 → 10), four tier-1 and four tier-2 stat nodes, and five single-rank nodes. The per-level rows sum the five main nodes:

Level	Shell Credits	Materials
Lv. 2	7,500	LF Mech Core ×10 Incomplete Combustor ×10
Lv. 3	10,000	LF Mech Core ×15 Incomplete Combustor ×15
Lv. 4	22,500	MF Mech Core ×10 Aftertune Combustor ×10
Lv. 5	30,000	MF Mech Core ×15 Aftertune Combustor ×15
Lv. 6	80,000	HF Mech Core ×10 Remnant Combustor ×15
Lv. 7	150,000	HF Mech Core ×15 We Who Question ×5 Remnant Combustor ×25
Lv. 8	250,000	FF Mech Core ×10 We Who Question ×5 Reverb Combustor ×10
Lv. 9	350,000	FF Mech Core ×15 We Who Question ×5 Reverb Combustor ×15
Lv. 10	500,000	FF Mech Core ×20 We Who Question ×5 Reverb Combustor ×30
Total	2,030,000	every material, once each (table below)

Total rebecca forte materials

Material	Total
LF Mech Core	25
MF Mech Core	28
HF Mech Core	40
FF Mech Core	57
We Who Question	26
Incomplete Combustor	25
Aftertune Combustor	28
Remnant Combustor	55
Reverb Combustor	67
Shell Credit	2,030,000

Stat bonus and single-rank nodes

Nodes	Shell Credits	Materials
Single-rank nodes (×5)	30,000	MF Mech Core ×3 HF Mech Core ×3 We Who Question ×2 Aftertune Combustor ×3 Remnant Combustor ×3
Stat bonus nodes, tier 1 (×4)	200,000	HF Mech Core ×12 Remnant Combustor ×12
Stat bonus nodes, tier 2 (×4)	400,000	FF Mech Core ×12 We Who Question ×4 Reverb Combustor ×12

Where to farm Rebecca's materials

Past Reveries

Local specialty. Found at Overworld routes.

Grows in the wild and respawns every couple of days; interactive-map routes cover a full loop.

Nightmare Flashdrive

Boss drop. Found at Nightmare: Adam Smasher (world boss).

Claim the reward for 60 Waveplates.

LF Mech Core

Enemy drop. Found at Tacet Discords across the overworld.

The Mech Core series drops from matching enemies; the Synthesizer converts lower tiers into higher ones.

Incomplete Combustor

Forgery Challenge. Found at Forgery Challenge.

Open days rotate through the week, so check the Guidebook before spending Waveplates.

We Who Question

Weekly boss. Found at Denia (weekly challenge).

Three reward claims per week, so the full 26 takes about nine weeks.

Shell Credit

Currency. Found at Simulation Training, quests and events.

About 2.2 million Shell Credits in total: 170,000 for ascension and 2,030,000 for the full forte board.

FAQ

How many Past Reveries does Rebecca need?

60 in total: 4 at the first breach, then 4, 8, 12, 16 and 20 at each breach up to level 90.

How many We Who Question does Rebecca need?

26: twenty for the main forte nodes at levels 7 to 10, four for the tier-2 stat nodes and two for the single-rank nodes.

Where does Nightmare Flashdrive drop for Rebecca?

From Nightmare: Adam Smasher, the world boss; claim the reward for 60 Waveplates.

How many Shell Credits does it take to fully build Rebecca?

About 2.2 million: 170,000 for ascension from level 20 to 90 and 2,030,000 for the entire forte board.

Planning the full build? Rebecca's stats, skills, passives and resonance chains live on the Rebecca kit page.