S-104 (Boss)

S-104 (Sin)
Location(s)	ERI Grave

Sin is the first required boss; this fight is an intense, one-on-one duel.

Pre-Fight

After deactivating the dome from within ERI, ERI will reawaken. Sin will then appear and seems to converse with an entity that may be associated with The Gift, before drawing their sword and facing towards an enormous being. Right before ERI attacks them, they will fire off an enormous slash and cut off ERI's arm. Knocking it out. Sen will then remark on how Sin "always causes a scene". After Sen arrives at the arena, Sin will talk with them for a bit, remarking on how Sen was "never one to sit idly". The mysterious entity seems to communicate with Sin again, and the battle begins.

Attacks

Combo A

• Description: Sin slash diagonally twice, which is followed up by an upper slash and a "helm breaker"(slamming slash).
• All attacks are parryable

Combo B

• Description: Sin slashes diagonally twice, which is followed up by a fast unsheathing attack and a fast downward slash.
• All attacks are parryable

Unsheathe

• Description: Sin uses a fast unsheathing attack, followed up by a fast downward slash.
• Can be parried

Dodge

• Description: After being hit a number of times, Sin will rapidly reposition behind Sen in a circular motion, before using a singular horizontal slash attack.
• Can be parried

Helm Breaker

• Description: Sin jumps in the air and uses a downward slash.
• Can be parried

Dismantle

• Description: Sin backs up a considerable distance, before dashing towards Sen at an enormous speed and causing a small storm of slashes upon arrival at Sen's location.
• Can be parried
• Happens in response to Sin being hit

Post-Fight

Sin and Sen will put each other in a stalemate, with Sin pointing their gun at Sen while Sen places their blade on Sin's neck. ERI will then reawaken and fire a laser at the arena. V and Sen will escape the blast, and it is unknown what happens to Sin. However, it is highly likely that Sin survived. Now, the battle with Replica begins.

Tips and Tricks

• Almost all of Sin's attacks are immensely fast, with seemingly little to no telegraph on when they will occur. However, paying attention to Sin's movements will reveal what attack will be used next. For example, there is a deviation between Combo A and Combo B after the second attack which will show which attack is being used.
• Memorizing attacks is a high priority if you want to beat Sin.
• Sin's Unsheathe attack is very fast and is on an irregular tempo, making it very easy to be comboed to death if you aren't paying attention.
• Some of Sin's attacks are dangerous to block, as the knocking back animation is a perfect opportunity for Sin to quickly thrash you if you aren't prepared to immediately parry.