Question 1

How do I unlock the katana in Sephiria?

Accepted Answer

The Moonlit Katana is hidden: find the secret room on Floor 3 (cracked wall, dash into it) for the Rusty Key, then open the waterfall chamber on Floor 8 after the bridge section.

Question 2

How do I unlock the staff in Sephiria?

Accepted Answer

The Apprentice Staff is one of the two second-starter options offered when you talk to JJ at the Bunnyville gate (the Hunter's Bow is the other).

Question 3

How do I unlock all weapons in Sephiria?

Accepted Answer

Shop weapons (Spear, Twin Daggers) stock after your first Floor 3 clear; the Greatsword is forged from Short Sword +3 at the Bunnyville bench; the War Hammer merchant appears after lighting 3 braziers on Floor 7; the Crimson Blade drops from Mole Stronghold elite chests (~8%); the Moonlit Katana is hidden behind the F3→F8 secret-room chain.

Weapon	DPS est.	Fits	How to unlock
Short Sword	~380/s (base)	Vampire / attack-speed builds	Starter — available from run one.
Greatsword	~310/s (but ~620/hit)	One-shot / crit builds	Bunnyville forge: upgrade Short Sword +3 (800g) — the bench unlocks after your first Guardian kill.
Spear	~340/s	Kiting / safe multiplayer DPS	F4 shop stock after clearing Floor 3 once.
Twin Daggers	~350/s + backstab ×2	Backstab / dash-heavy builds	F4 shop stock after clearing Floor 3 once.
Hunter's Bow	~290/s	Multiplayer backline	Picked as your second starter when you talk to JJ at the gate (staff is the other option).
Apprentice Staff	~260/s + burn 40/s×3s	Support / DoT builds	Picked as your second starter when you talk to JJ at the gate (bow is the other option).
War Hammer	~330/s + stun	Stun-lock memes, co-op off-tank	Wandering merchant appears after lighting 3 braziers in Floor 7.
Crimson Blade	~420/s at full HP, ~610/s below 30% HP	Low-HP berserker builds	Mole Stronghold elite chest drop (~8%, community count n≈200).
Moonlit Katana	~470/s perfect-cancels	Dash-cancel masters / heat runs	Hidden: the key from the F3 secret room opens the F8 waterfall chamber. See Floors → Secret Rooms.

WEAPONS

The "max DPS" video claim