×...defeated Fenrir, then went through the time loop sequence, then...

×...entered the throne room, dodged Egther's ice blasts, climbed the pillar, jumped pillar to pillar, stabbed him in the back...

×...after he appears in front of me and I go into combat mode, he disappears and a fire blast comes from off the screen. I don't seem to be able to dodge it, and it's instantly fatal.

×...did I miss something earlier in the game, and now I'm screwed? I saw a reference to Loki and poison elsewhere on the forums... I never saw any of that in my playthrough so far. (If so, where was Loki?) Or is there some piece of the combat controls that I'm missing? I've been playing on easy... is there some dodge I haven't mastered?

×Go back and find the poison. You already have the hints there regarding where it is.

×Where's Loki, and do I have to go back before the "Savior" act to find him? While doing "Savior," I recycled some of my late saved games because I was hitting the limit, so I might have to bounce pretty far back.

×Got me back to Andvari's workshop, which is apparently how I get to Loki...

×...via a tile-sliding puzzle? I suck at these. Unless there's some trick or pattern I can follow, I'm going to have to give up here.

×The tile sliding puzzle isn't that hard. There isn't actually a 'correct' solution to it. You just need to make it so that there is a path to Loki who is behind the ice wall

×Once you have the tiles forming a passageway, you click done and head over to that area of the map.

×When exiting Nivadellir, I received a message that the tunnel to the west looked different. I explored the entire area. The most promising-looking time was when I went West, North, West and found an open tunnel going North. But then I got told the tunnel led to a dead end.

Which tile is the thing supposed to terminate with? The one with yellow sparklies, or one with a straight line to the connector?

×Consider the things OUTSIDE of the slider board.

×...the Loki puzzle. I jump across, collect the venom, and if I'm lucky and don't misaim my cursor, I jump back. I never beat Sigyn to the door, and most of the time in my hurry I misclick and kill myself somehow. Unless there's some way to do this other than pure speed, it's beyond me.

×Watch what Sigyn does.

×As soon as you jump across, she interrupts whatever she's doing and starts her progress towards the door. The only thing she won't interrupt is her walk back towards Loki (she'll finish it then immediately turn around), but I'm still not twitchy enough to pull it off in that window and, again, usually don't click precisely enough to not die.

×I'm not sure how to get the poison as a rogue, but timing is everything with Sigyn. Do not jump while she's emptying her bowl, wait for her to resume her position first. Plan ahead and have an empty flask already selected as your "active" item, so that you don't lose time. I barely made it with the sorceress spell, so for a rogue I believe being in "run" mode instead of "walk" should be essential. Perhaps you could also try lowering the game's speed, that would give you some more time to select actions, etc.