Wiki has a few tips on infil, but all the ways they have posted is dependant on combat. I'm terrible at archery and anyways I just didn't feel like fighting. So I figured I could do it another way.
Wiki also has posted a few tips on how to predict the orb, but I thought a walkthrough might be nicer for some.
Step 1) Download some sort of stopwatch, or use a real one (I recommend a downloaded one). I downloaded this one: Download Stopwatch - Stay On Top Stopwatch.
Step 2) Get the pass, head to baol. Window your screen, then make the stopwatch as small as you can while still being able to easily read it. Position it wherever you feel you can most easily read it.
Step 3) Enter the dungeon (wear your robe). Start the stopwatch, click an orb.
Before we continue, let me show you an image:
yyy
a b
d c
As soon as you enter the dungeon, the orb is predetermined. Let's assume it's A in this case, but it's random, so you have to experiment your first room (your first room is hte one you're most likely to die in).
So, now, you're in a room with 4 orbs. This is what each one of them is, assuming A is the one that opens:
A: Opens door
B: Evil monsters- won't detect unless you have a robe
C: Evil monsters: won't detect unless you have a robe
D: GUARD SKELES OH CRAP.
Every 10 seconds this rotates clockwise. In other words, A will become the skeles (oh noes), B will become the opener, and C and D will be the other monsters.
Just experiment this first door. You don't lose anything if you die (I recommend putting blessed stuff in your inv, so you don't lose blessings.). If you get skeles, hit the orb that's the next clockwise. If not, just experiment.
If this isn't making any sense to you, here it is in wiki terms:
Which orb will open the door or spawn monsters is pre-determined. The orb that opens the door is the same one in every orb room in a dungeon. Which orb opens the door will rotate clockwise every 10 seconds. (So if you opened the door on your first try and there is another orb room right after it, hitting the next orb in the cycle 10 seconds after you opened the last door should open the next one). In dungeons where each orb has a different spawn, which spawn an orb would give also rotates on the same cycle. In Baol Infiltration, the orb that would have opened the door before the rotation is the one that spawns Hellhounds after the rotation. (So when the northeast orb would open the door, the northwest orb is the one that spawns Hellhounds.)
Mkay. Let's say you hit orb A 5 seconds into the dungeon. Go into the next room*. If less than 15 seconds have passed, hit orb B. If more then 15 but less than 25, C. If more then 25 but less then 35, D.
Let's say it was right next to it and you hit orb B. Again, keep careful track of when you hit orb B. Let's say it was at 13 seconds. Move into the next room. Let's say it was after a realllyyy long hallway and now you're at 1:07. Crap. Well, let's see. At :14- :23 it was C. At :23-:33, it was D, (continue this way until you're at the end), at :33-:43, A, at :43-:53, B, at :53-1:03, C, at 1:03-1:13, D.
Phew. Unfortunately, while you were figuring it out, it's now 1:36. Just keep figuring, you'll eventually catch up to the time.
Rinse and repeat. There are only 11 rooms, so even if you mess up it's not a huge deal, you're figure it out eventually.
Congratulations, you've finished the mandatory annoying quest for this generation! Now to survive taming wild boars, finding fragments, babysitting Cai and Leymore, Taillteann Defensive Battle, and Arenen's RP!
*WARNING: I am not entirely sure if the timer resets after you hit the orb. If it does, use the method I outlined above. If not, please disregard the part after the asterisk and follow this instead:
If less than 10 seconds have passed (since you entered dungeon, not since you hit A), hit orb B. If more then 10 but less than 20, C. If more then 20 but less then 30, D.
Move into the next room. Let's say it was after a realllyyy long hallway and now you're at 1:07. Crap. Well, let's see. At :20- :30 it was C. At :30-:40, it was D, (continue this way until you're at the end), at :40-:50, A, at :50-:60, B, at :60-1:10, C, at 1:10-1:20, D.
Phew. Unfortunately, while you were figuring it out, it's now 1:36. Just keep figuring, you'll eventually catch up to the time.
Future Updates:
I may try to clarify this later based on feedback. It does work, it's how I did my infil after weeks of trying and a failed attempt at using a glitch (I'm usually a by-the-rules player who doesn't have a single mod but I was getting desperate). However, as I said, the wiki isn't very clear on whether the first way or the second is correct. I used the first, but perhaps I just got lucky and the second is how it's calculated. If anyone could tell me, I'll update the guide.
Hope this is useful to you.