How to Make a Combat System in Roblox (2026 Guide)

Architecture Overview: Client Prediction, Server Authority

The most common mistake in Roblox combat systems is running everything on the client or everything on the server. Neither works well alone. The correct approach is client-side prediction with server-side validation. The client handles input detection, plays animations immediately for responsiveness, and sends attack requests to the server. The server validates the request (is the player alive, is the cooldown elapsed, do they have the weapon equipped), performs the hitbox check from its own physics state, and applies damage. This prevents speed exploits and damage hacks while keeping the game feeling responsive. Use a RemoteEvent for attack requests — never trust client-reported damage values or hit targets.

Input Buffering and Combo Chains

Raw input detection creates a clunky combat feel. When a player presses the attack button during an active swing, that input should be buffered and played as the next attack in the combo chain once the current animation reaches its cancelable window. Implement a simple input buffer by storing the last input timestamp and type. During each animation frame, check whether the current attack has reached its "cancel point" (typically 60-75% through the animation). If a buffered input exists and the cancel window is open, fire the next attack in the combo table. Reset the combo index to zero if no input is buffered by the time the recovery window ends. This creates the snappy, chained feeling players expect from games like Deepwoken or Blade Ball.

• Store a combo index (1 through N) that increments with each successive hit
• Define a combo table mapping each index to an animation ID, damage value, and hitbox size
• Set a cancel window (e.g., frames 12-18 of a 24-frame attack) where buffered input triggers the next attack
• Reset the combo index after a configurable idle timeout (0.8-1.2 seconds works well)
• On the server, validate that combo timing is physically possible to prevent packet-edited rapid combos

Hitbox Detection: Spatial Query vs. Raycast

Roblox offers several approaches for hit detection. The two most reliable for melee combat are spatial queries (workspace:GetPartBoundsInBox or workspace:GetPartsInPart) and shaped raycasts. Spatial queries work well for wide sweeping attacks — create a box or sphere in front of the attacker and check which character hitboxes overlap. Raycasting works better for thrust attacks and precise strikes. Whichever method you choose, always run hitbox checks on the server using the server-side character positions. Apply a small tolerance radius (1-2 studs) to account for network latency, but reject hits that are wildly out of range. Tag each hitbox result with the attacker and a unique attack ID to prevent the same swing from registering multiple hits on the same target.

Animation Integration and Timing

Combat animations drive the feel of your system. Load your AnimationTracks on the client and play them immediately on input for zero-latency feedback. Use Animation Events (markers embedded in the animation timeline) to synchronize gameplay events: a "HitFrame" marker triggers the server hitbox check, a "CancelOpen" marker enables combo input, and a "RecoveryStart" marker begins the cooldown. Set attack animations to Action4 priority so they override movement but not hit-stagger animations. Adjust the AnimationTrack.Speed property to fine-tune attack speed without re-authoring the animation. For a polished feel, blend between combo animations with 0.1-0.15 second fade times rather than hard cuts.

• Use :GetMarkerReachedSignal("HitFrame") to fire hitbox logic at the exact impact frame
• Set animation priority to Enum.AnimationPriority.Action4 for attacks
• Use fade time of 0.1 seconds between combo chain animations
• Play hit-react animations on the victim at Action3 priority so they do not override the attacker's animation

Damage, Knockback, and Feedback

When a hit connects, the server should apply damage through a central DamageService that handles health modification, death checks, and event broadcasting. Knockback is applied as a short VectorForce or LinearVelocity impulse on the server (never from the client). Broadcast the hit event to all clients so they can play VFX, screen shake, and hit-stop (freezing both characters for 2-4 frames on heavy hits). Hit-stop is the single most impactful juice technique — it creates the feeling of weight and impact. Combine it with a brief camera shake (0.05 second duration, 0.3 stud magnitude) and a particle burst at the contact point. KitsBlox combat animation packs include marker data for hit timing and are designed to chain with proper cancel windows, saving you significant iteration time.

Anti-Exploit Hardening

Combat systems are the most exploited feature in Roblox games. At minimum, enforce these server-side checks: validate that the attacker is alive and not stunned, verify the weapon is equipped in their character model, enforce cooldown timers per attack type (store the last attack timestamp on the server and reject requests that arrive faster than the animation allows), range-check that the target is within the weapon's maximum reach plus a latency buffer, and rate-limit RemoteEvent calls to reject packet spam. Never use string-based remote identification without a whitelist. Consider adding a server-side animation length check — if the client claims they finished a 0.8-second animation in 0.2 seconds, reject the request.