Pax said:
Duck down, move forward, and spring up (all within the Spectre's charging movement limit) -- right behind the selected target. Whack 'em.
If the target is close to teh furniture, the pop-up trick might only be a 5' step, so a full attack might be possible.
Well, unless the spectre is using non-Euclidian physics, ducking down, moving forward, and springing up aren't likely to constitute moving in a straight line. It shouldn't be able to charge (or partial charge, which is important -- see below).
As for the pop-up-5'-away trick, it's very likely that the spectre in question will get a surprise round. In which case, it won't get a full attack: it'll only get a partial attack. It can partial charge, but again Euclidian geometry limits its movement to a straight line. OTOH, if it charges straight across the room while the party is surprised, only folks with combat reflexes will get an AoO. And, being a spectre, it can charge
through other party members to get at its victim.
Personally, I think that incorporeal undead need to strike at a person's torso or head to deal their damage: I envision it as damaging their soul. All the beneath-the-floor spectre will be able to hit is their soles.
The attack once, sink into the floor/rise from the floor, attack once routine is very effective for spectres, but as other shave said, readied actions defend against it pretty well. Our group fought a pair of spectres recently and went through this routine with them.
Daniel