Regarding throwing, how should it be according to PnP rules and how does it work in the game
According to PnP, you
should need to make one check to grapple the enemy (athletics vs enemy's athletics or acrobatics).
There are no PnP rules for Throwing a creature so it requires homebrew. The most relevant rules are:
- Shove (move enemy 5 feet with a successful opposed athletics check)
- the fact that grappling a creature allows you to move them with you at half speed
- characters can push, drag, or lift a weight in pounds up to 30x your strength score.
So something easier than Shove but more difficult than "can throw anyone 30 feet trivially and with no action-cost" would be appropriate.
E.g., athletics check at Advantage, can throw a creature up to 20x your strength score, and throw them 15 feet.
These checks would be attack-equivalent actions, so if you can make multiple attacks each of these would replace a single attack.
If you throw a living creature against another creature, who takes damage and who makes a check?Again, there are no exact PnP rules here so it requires slight homebrew. Either you'd made an attack roll against the enemy's AC, or they'd make a Dex ST to avoid damage.
RAW, the thrown creature only takes damage if they fall more than 10 feet. That said, taking no damage makes Throw equivalent to a shove, yet Throw requires 2 (attack-equivalent) actions. Thus, it's reasonable that it deals damage in addition to any fall damage.
