Combat in Soul Reaver is a hack and slash system, involving the use of combinations of various different attacks before a finishing move. Raziel's enemies are grouped into humans, spectral creatures, and most commonly, vampires. Human enemies include peasants, vampire hunters and vampire worshippers. In the spectral realm, players fight minor enemies called Sluagh and the souls of dead vampires who have become wraiths. Each brood of vampire enemies has unique powers reminiscent of their clan leader. Human and spectral enemies can be killed with Raziel's claws or any weapon, but vampires must be bludgeoned into a stunned state and then destroyed by impaling them, lighting them on fire, or tossing them into a hazard such as sunlight or water. When killed, enemies leave behind souls that replenish Raziel's health, which automatically decreases in the material realm and increases in the spectral. Possession of the Soul Reaver sword stops automatic degeneration of health in the physical realm, but Raziel loses the sword instantly if he sustains damage and can regain it only by restoring his health to full.
At first, Raziel can jump, glide using his torn wings, move blocks, and pick up and throw objects and enemies. Initially unarmed, he fights using his claws, but can alternatively use weapons such as rocks, torches, spears and staffs, and the Soul Reaver. Raziel can freely shift to the spectral realm, but can return to the material realm only through special portals when at full health. Raziel automatically shifts to the spectral realm if he runs out of health. As the game progresses, Raziel gains the powers of his clan brothers after defeating them and becomes able to phase through gates in the spectral realm and climb walls in the material realm. Initially vulnerable to water, he overcomes this weakness and learns to swim. He also gains the ability to constrict objects and enemies with a band of energy, although this feature was one of the few abilities not to feature in future games. Players can find an ancient relic that gives Raziel the power to fire bolts of telekinetic energy, which cause little damage by themselves but can knock enemies into hazards and push objects from a distance. Baptism in holy flame can transform the Soul Reaver into the Fire Reaver, which can set enemies aflame and adds fire to Raziel's telekinetic bolts. Players can also find magical glyphs that allow Raziel to expend magical energy to attack groups of enemies simultaneously. These glyphs typically involve vampire weaknesses such as sunlight, fire, water, or sound, as well as additions such as telekinetic force (available well before the normal telekinesis becomes available) and the causing of earthquakes to temporarily stun enemies. Glyphs are acquired through finding glyph altars, specific locations in Nosgoth where the skills can be learned, and solving a puzzle before being granted the magical ability. However, Raziel begins the game with access to the 'Shift' glyph, granting the ability to shift between the material and spectral planes, with no glyph altar necessary.
Story
As the game begins, Raziel approaches Kain's throne and extends newly grown wings. In an act of seeming jealousy, Kain tears the bones from Raziel's wings and has him thrown into the Lake of the Dead, a large natural whirlpool; however, Raziel is resurrected as a wraith by The Elder God to become his "soul reaver" and kill Kain, thus restoring Nosgoth. With The Elder God's guidance, Raziel adapts to his new form and returns to Nosgoth. Infiltrating a Necropolis inhabited by the Melchahim vampires, Raziel finds his brother Melchiah, who has devolved into a beast unable to sustain his own flesh. After Raziel kills Melchiah and absorbs his soul, he confronts Kain among the ruined Pillars of Nosgoth in the Sanctuary of the Clans. Kain does not appear surprised to see Raziel, apparently having even been expecting him, and implies that he has destroyed Raziel's vampire clan, which only enrages Raziel even further. When Raziel begins to criticize him, Kain simply launches a tirade against him before noting what has become of the empire and engaging him in combat. Kain quickly overpowers Raziel and attempts to strike him down with the Soul Reaver, a powerful sword that absorbs its victims' souls; however, the Reaver shatters when it strikes Raziel, and Kain escapes, strangely satisfied. Raziel enters the spectral realm to find the blade's soul-devouring spectral form, which binds itself to him. After this, Raziel meets Ariel, who restores his strength, and learns of Zephon's location from The Elder God.
Raziel ventures into a large cathedral once inhabited by the humans and finds the Zephonim clan. After ascending into the cathedral's spires, he finds that Zephon is now a large insect like creature whose body has merged into the cathedral spire in which he dwells. Raziel kills Zephon and uses the gained power to infiltrate an ancient crypt. There, Raziel discovers coffins for members of the Sarafan, a fanatical order of vampire hunters killed centuries before Kain's rule. To Raziel's horror, he finds the crypt was designated for him and his brothers; as cruel irony, Kain revived the Sarafan to serve him as his vampire sons. Raziel ventures through a secret passage under the crypt and finds a flooded abbey inhabited by the Rahabim clan, whose members have mutated into amphibians; its leader, Rahab, has become a merman. Raziel tells Rahab what he has learned about their human pasts, but Rahab is unmoved, claiming that Kain "saved" them, and attacks. Raziel defeats Rahab and absorbs his soul, then crosses the Lake of the Dead to the abandoned fortress of his brother Dumah. The Elder God explains that the Dumahim vampires were scattered following an invasion of human hunters. Raziel eventually finds Dumah shackled to his throne with his heart pierced. Raziel revives Dumah and leads him into a giant furnace, burning him alive and absorbing his soul.
Afterward, Raziel discovers the Oracle's Cave, where Moebius the Time Streamer once hid the Chronoplast, a magical time machine. Raziel traverses the caves and finds Kain in the Chronoplast's control room. Raziel is angered over what he has learned, and Kain says his actions are justified due to his being subject to destiny, before proceeding to inform Raziel that the Sarafan were far from the noble crusaders that Raziel believes them to be when the latter demands to know why he created him, which Raziel refuses to listen to. Raziel attacks Kain while the latter continues to adjust the Chronoplast's controls. Although Raziel eventually gains an advantage, the Chronoplast activates, and Kain escapes through a time portal, beckoning Raziel to follow. Raziel complies, ignoring warnings from The Elder God. As the game ends, Raziel emerges from the timeslip and is greeted by Moebius, leading into the events of Soul Reaver 2.
