Baldur’s Gate 3 is a story-rich, party-based RPG set in the universe of Dungeons & Dragons, where your choices shape a tale of fellowship and betrayal, survival and sacrifice, and the lure of absolute power. (Website)
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FWIW, when I'm setting up ambushes I always ungroup everyone (hotkey is g by default). Then I put everyone in position, set up buffs and then swirch it onto turn based mode, before springing the trap. I find leaving characters grouped causes more problems than it solves.
Let me know if I've misunderstood something though.
I do the ungrouping now, but it still drops everyone out of turn based and I need to quickly micro everyone back in before I lose rounds of my buffs.
Hopefully it's just me, or they make an option or fix for it, I've had to restart combats a bunch of times because of it
Husband and I have been playing for a few weeks (with early access) and that's how it was for us. If you manage to pull off a surprise attack while still in stealth, you can get more as long as your character(s) are not seen. However if the enemy spots just one (or more) of your characters, let's say the "surprise attacker", they will start the next round without those characters not seen or engaged in the attack until you bring them in sight or in combat. Essentially, you can attempt to use that as a surprise attack for a second/third character if they attack from outside the visual range of the enemy. Then they will get placed into the initiative queue. At least that is what we've experienced.
[Potential Spoilers] Best example is outside the cathedral with Gimblebock, the mage, the archer and the other guy. If we sneak up behind the archer, we can kill him without the others spotting us. Then we get our furthest ranged casts and dual hit the mage at the same time, killing her. At that point the other two downstairs realize there's a fight and we force them to come upstairs to fight us. Still may have to walk the non-caster party members to actively join the combat queue.
Before you end turn of your suprise attacker, use that time to bring everyone else into combat, then end your turn. We learned that the hard way, fighting a group of mobs when Shadowheart or some other companion is still just sitting outside.
You may need to make sure all characters are grouped/chained together. That's my only guess of why this has happened.
Price you pay for ambushing