This thread is about Level Up, and how it could be used to finally get rid of a lot of old d20 crud from 5E, but since you mention Pathfinder 2... and specifically, how you phrase it as if Pathfinder 2 somehow is better than Pathfinder 1...
Well... let's just say you have it coming
Did you know... a greataxe user must spend an action to switch from holding the axe (requiring one hand) to wielding it (requiring two hands)?
If you retrieve a two-handed item with only one hand, you still need to change your grip before you can wield or use it.
Some abilities require you to wield an item, typically a weapon. You're wielding an item any time you're holding it in the number of hands needed to use it effectively. When wielding an item, you're not just carrying it around—you're ready to use it. Other abilities might require you to be...
2e.aonprd.com
Did you know... that if you fall off a cliff, you need to have a hand free to save yourself? Meaning, if you wield a greataxe, or fight with sword & board, you're sold out of luck!
The Grab an Edge does not require your hands to be free, only "not tied behind your back or otherwise restrained". But look closer! Unless you score a critical success, a regular success won't do diddly squat for you unless you have one hand free. And don't think you can let go (with one hand) of that greataxe of yours - the Release action might be free, but free actions still can't be spent outside of your turn, when you commonly fall off cliffs.
If you have no hands free, you continue to fall as if you had failed the check.
When you fall off or past an edge or other handhold, you can try to grab it, potentially stopping your fall. You must succeed at a Reflex save, usually at the Climb DC. If you grab the edge or handhold, you can then <a style="text-decoration:underline" href="Actions.aspx?ID=33">Climb</a> up...
2e.aonprd.com
If you want to prepare to Release something outside of your turn, use the Ready activity.
You release something you're holding in your hand or hands. This might mean dropping an item, removing one hand from your weapon while continuing to hold it in another hand, releasing a rope suspending a chandelier, or performing a similar action. Unlike most manipulate actions, Release does not...
2e.aonprd.com
(I gotta love the way Release is a Manipulate action, yet doesn't trigger Attacks of Opportunities that, wait for it, are triggered by Manipulate actions!)
What this means is that you need to prepare by stowing your shield or greataxe before getting anywhere close to a cliff, then wield a backup (single-handed) weapon... ¯\
(ツ)/¯
Did you know... that you can't make a special attack with a weapon you haven't yet drawn, despite having Quick Draw? Quick Draw lets you - with a single action - Interact to draw a weapon, then Strike with that weapon. But Strike means the specific Strike action, not just any old attack action, such as Twin Takedown (Ranger) or Twin Feint (Rogue). So you need to, in that first round of combat reverse the order of your actions. Instead of first performing your Twin Takedown or Twin Feint first (without MAP) and additional Strike(s) only later, you need to first make a regular Strike (through Quick Draw) and only then performing your Twin Takedown or Twin Feint (at MAP). Isn't this wonderful? You get to recalculate your entire attack routine - fun!
Quick Draw is an action that lets you Interact, then Strike with a weapon.
You draw your weapon and attack with the same motion. You Interact to draw a weapon, then Strike with that weapon.
2e.aonprd.com
In other words,
thank you for giving me the opportunity to illustrate
exactly the kind of horrifying rule nobody asked for and nobody needs. I'm arguing they have
zero reasons to exist in D&D Advanced 5E Level Up!
