How Should I Multiclass For A Gloomstalker Assassin Build Bg3?

If you're chasing a ruthless backstab sniper in 'Baldur's Gate 3', mixing Gloom Stalker ranger with Assassin rogue is such a satisfying combo — it turns opening rounds into cinematic, one-shot mayhem. I like to treat this build as a two-phase playstyle: the setup and the blast. You hide, position, and use every trick to secure surprise and advantage; then in the first exchange you unload everything — Assassin crits, Sneak Attack, Gloom Stalker bonus attack/damage, Hunter’s Mark or other ranger buffs, and hopefully Sharpshooter. The net result is that ambushes feel delightfully lethal and can swing fights before enemies have a chance to react.

For multiclass splits I usually aim for the minimum Rogue investment to unlock the core Assassin toolkit: Rogue 3 for Assassinate (surprise = auto crit on many targets) and Cunning Action (bonus-action Hide/Dash/Disengage). From there the choice depends on whether you want sustained scaling or a burst-focused glass cannon. A popular, very effective route is Rogue 3 / Ranger 5. Ranger 5 gives you Extra Attack (more hits in that opening round) and gets you into useful ranger spell territory and subclass features. After that point you can either keep leveling Rogue to grow Sneak Attack and survivability, or push more ranger levels for better spells, ASIs, and subclass improvements. If you want nonstop single-target damage later in the fight, channel more levels into Rogue for bigger Sneak Attack. If you want reliably stronger first-turn ambushes and spell utility, invest in Ranger.

On gear and feats I swear by a high-Dex build (Dex > Wis > Con). Expertise in Stealth (and possibly Perception) is non-negotiable, since you need to consistently get advantage and surprise. For feats, Sharpshooter transforms the build if you commit to ranged: the damage multiplier on those auto-crits is wild. Alert is also incredible because it helps you go first even if the surprise window is narrow. Crossbow Expert is useful if you want to fire in melee or ignore loading on heavy crossbows, but personally I prefer longbow + Sharpshooter for the clean high-damage opening shot. If you go melee, rapier + mobility/bonus positioning tools works too, but ranged ambushes are where the Assassin synergy shines the most.

Playstyle tips: always think like a hunter — set up the ambush with stealth or positioning, let allies draw attention so targets are flagged as surprised, and then hit hard in that first round. Use Cunning Action to break line-of-sight after attacking if you need to reposition. If surprise isn’t available, hide and wait for advantage from cover or flank, then trigger Sneak Attack. Personally, I love how this combo turns the early minutes of combat into a tense, cinematic moment — watching a target drop to a single volley or two never gets old. It feels ruthless in the best possible way.