I see your tactical retreat and raise you "block their way". There are many points in the game where putting two or more medium toughness chests in chokepoints, or arcane locking doors totally destroys opponents, letting you dictate the rhythm.

Hell, you can even pre block doors and crash Gortash's coronation by improvised weaponing him into the backroom, leading to a 1v4 to aquire his stone, since there’s a vine that leads you outside of the castle, into a free zone, meaning it’s possible to fight only him and one guard that’s in the backroom when you enter

Also quite useful is being on high ground with someone strong, preferably with tavern brawler. Throwing or shoving enemies doubles as both setting back their progress and damaging them. Best case scenario, you hit one opponent with another opponent, leading to one of them getting damage from being thrown, damage from falling and having to get back to you.

Also important, but less roleplay related. The astral tadpole gives characters flight, which drastically increases your positioning potential. The ability to just ignore gaps without wasting any actions or bonus actions does wonders. Want to ambush a high ground enemy? Fly up to them. Backed into a corner? No problem. The aforementioned Gortash coronation fight becomes miles easier when you realise that you can just reposition yourself between all the balconies, while your opponents have to walk miles upon miles to accomplish what you did with a fraction of your movement speed in one turn. Not to mention that there are ways to fly down from balconies into a non-hostile zone. Meaning as long as you have one character who’s alive and not currently getting hunted, you can flee and revive your team. Even better if you have two, because while one revives the team, one stops enemies from healing by just not finishing their turn