@Whocrazy, I've passed the point you're talking about, but please remember the spoiler warning when discussing later parts of the game. As for your question:
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They always fall at a consistent pace. Listen to the clunks, and run past just after you hear one land. You should have enough time to make it. You will need to do this three times.

Yikes. Sorry about not putting the spoiler space warning in my last message.s
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Those things cut your health down to 1 point! that's evil! Thank "heavens" the last blow doesn't kill you!

Ok, Major end of game
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I've reached the battle against Renzina, after fighting the Halfling assassins, but after she regenerates several times, I deal damage to her but her health always stays at 100%. Does anyone have tips on how to pass this part? I believe it's her fourth regeneration.

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I'm currently in the Paladin Ruins. I have found 1 teleporter, which takes me to a memorial room, I believe. And, I found another save point, on the bottom right. When I continue right, I see that there is a teleporter. I try to go to it: "I have nothing against you. Please leave." Any tips?

@Brad Helium lounge spoiler!
Nah, level 26 is more than enough. If you've got coins you could always try upgrading Ross's impact at the shop. Otherwise just keep attacking with charge of fury or flame blizzard.

@Quasar endgame S
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In her 4th form, just defend; she's preparing to self-destruct but it won't kill you if you're defending.

@David Postgame S
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The "I have nothing against you" is actually an optional boss who you could have battled while on the ship. Since you didn't, the boss has nothing against you. If you go back to the ship, search the north wall of the holding area (found in lower chamber 2) for a hidden item. Collecting that will initiate a boss battle.
There's a teleporter somewhere on Paladin ruins F2 that'll lead back to the ship. If you don't want to search for that, just die; you'll be sent back to your cabin and can return to the ruins anytime.

@David,
There's no such thing as recreation floor 5. Control central and wing 5 are only available for a limited time and become permanently unavailable after the events at the employee's lounge.

Hi.
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What's the best stratagey for beating Director Shevern?
I think the way fighting him works is I hit him with the embodiment of crualclaw first
then I go to defend the second time, then I hit him with the scrole etc etc.
Can anybody give me some hints for this?
because it only deals 5% of the time, and I'm not sure if the way I'm following is the best.
regards.

Hmm, that doesn't work, as there isn't a way down.

I wonder which teleporter that was. There are a couple of optional events in the game which activate other quests in the aftergame but I'm cureous as to exactly which teleporter was blocked off. Are you sure you battled the boss in the holding area?

Yes, and what you can actually do with it is extremely interesting...

I haven't figured out how to use it yet...