Tordek falls to the orc's savage attack. Ignoring the combat raging around him, the orc swings his mighty axe, cleaving Tordek's skull like a ripe melon.
Back in 2e, my PCs would occupy the spot of a fallen foe. Then, they argued, the simple act of continuing to fight combat from that spot meant the foe would take incidental damage, effectively killing it (yet, ignoring the slippery mess the spot would be). Fine, I said, but I use the "if you can do it, they can do it" rule (though I let them do it first). So when I began to do the same thing they were strenuous in their objections. Likewise, they objected when I would coup de grace fallen PCs, even though they did it to my monsters first.
Because of this, I implemented several house rules and I'm asking for comments/suggestions for 3.5.
1) Coup de grace. Originally I said you couldn't do a CdG if combat was occuring within 20 feet of the action. Eventually, I decided that simply saying until the combat was over was easier. The unrealistic idea was that no-one would waste time doing a CdG when combat was undecided.
2) Attacking a fallen foe. If a foe falls, then a creature can choose to use one of it's regular attacks to strike it. Technically, one could do so with an AoO but it was decided by all to use the "That simply isn't cricket" rule.
3) Protecting a fallen comrade. No one really likes killing a PC in such a manner so I decided that you could protect a fallen comrade from such attacks by occupying its space. However, to do so involved a penalty. Essentially, one must stand there, relatively unmoving, so the PC loses its DEX bonus and all dex like AC bonuses (such as dodge) as well as similar abilities. Special note: if a creature has a free move action it can attempt it, outside of normal initiative, to occupy the spot before the enemy does.
It must be noted that I would never use these rules, nor even mention them, unless the PCs attempt these actions first.
Any comments/suggestions?