Start with the Nameless Blade
It is your initial one-handed sword and receives a free story upgrade. Weapon upgrades become available during the Two Brothers Weaponry story mission.
Nameless BladeNieR Replicant’s weapon choices combine attack strength, magic power, and weight, which affects attack speed. One-handed swords are the available class in Part 1; two-handed swords and spears become available later. Sealed Verses add ranged, defensive, and area effects, with a limited number equipped at once. The entries below focus on named core-game weapons and abilities with supported details, and flag story or quest conditions where given.

It is your initial one-handed sword and receives a free story upgrade. Weapon upgrades become available during the Two Brothers Weaponry story mission.
Nameless BladeFaith is described as very light at level 1 and can be obtained as an optional quest reward; it trades some attack for speed compared with heavier swords.
FaithEquip up to two Sealed Verses as the usual setup; choose among offensive, projectile-blocking, and continuous-damage effects.
Dark Hand Dark Wall Dark Whirlwind Dark ExecutionChoose a topic to see how it works, where it helps and what to consider.
The Nameless Blade is the starting one-handed sword, available after the prologue. Its attack rises from 100 to 204 and its magic power from 0% to 30% by level 4; it remains light throughout.
Understand this choiceThe Lily-Leaf Sword is a Part 1 village blacksmith purchase. At level 1 it has 123 attack, 20% magic power, and light weight; by level 4 it reaches 250 attack and 60% magic power, with heavy weight.
Understand this choiceThe Nirvana Dagger is a one-handed sword listed among Part 1 weapons. Its level 1 attack is 106, with 0% magic power; at level 4 it has 213 attack and 40% magic power.
Understand this choiceThe Blade of Treachery is found in a box in the Haunted Manor before its boss fight. It starts at 139 attack and 20% magic power; at level 4 it has 255 attack and 50% magic power. It is heavy at both levels.
Understand this choiceFaith is a Part 1 one-handed sword gifted by the mayor of the Forest of Myth after freeing the mayor and two residents from Deathdream. It has 147 attack and 20% magic power at level 1, rising to 266 attack and 50% magic power at level 4.
Understand this choiceThe Phoenix Dagger is sold by the Seafront blacksmith. It begins at 240 attack, 50% magic power, and moderate weight; at level 4 it reaches 346 attack and 80% magic power while retaining moderate weight.
Understand this choiceSunrise is a Part 2 spear purchased from the Aerie blacksmith when revisiting the area. It has 384 attack and 40% magic power at level 1, rising to 625 attack and 70% magic power at level 4.
Understand this choiceThis Part 2 spear is sold in Facade when revisiting it. Its attack rises from 467 to 693 and magic power from 50% to 80% between levels 1 and 4; its weight rises from heavy to very heavy.
Understand this choiceDark Hand sends a large magical hand forward to crush enemies. Charging it increases its power, providing an offensive option whose effect can be strengthened before release.
Understand this choiceDark Wall creates a large circular barrier that blocks projectiles. Charging the spell can expand the barrier so it fully surrounds the protagonist.
Understand this choiceDark Whirlwind sends damaging blades orbiting around the protagonist, dealing continuous, repeated damage to opponents nearby.
Understand this choiceDark Execution summons a line of spears from the ground that pierces opponents. Its effect can be multiplied to create more spears.
Understand this choicePart 1 offers one-handed swords; two-handed swords and spears appear as the story progresses into Part 2. Some weapons also require revisiting areas or completing quests.
The source says up to four Sealed Verses can be equipped, but doing so may require giving up evade or block controls.
Core-game progression choices: weapons available through story, shops, quests, and weapon upgrades, plus Sealed Verses. Excludes crossover and Recycled Vessel DLC equipment.
Explanations prepared with GPT-6 Luna and checked against the linked references. These are source-reviewed guides. They do not establish independently tested optimal builds or exact upgrade budgets. How coverage works.