Forgive me... but it's obvious to me now that I obviously did not read this closely enough and totally missed that one of those powers was an implement power with [W] Damage... That's really weird. I didn't think such a thing existed.
Well, based on the very same rules that I already cited, I would personally allow High Crit on Lingering Lightning, despite the fact that it's an implement power, because it applies weapon damage. Honestly, the description of it sounds like more of like an implement power, and doesn't sound like you are actually hitting with the weapon, but that doesn't change the fact it applies weapon damage.
For Sword Burst, I think this clearly falls under the opinion I gave earlier. No, for High Crit property.
For Spidersilk Slash, I can see how it's debatable. I'm going to rule no for High Crit property with it, but I do so with some reservations. I am leaning towards that being closer to the RAW. However, if I had a player argue for it, I think that I'd let them have it just because it is subject to debate.
If when confronted with 2 interpretations that are both reasonable and valid, I say it's better to choose the side that your players want and not worry too much about if you're right.
Well, based on the very same rules that I already cited, I would personally allow High Crit on Lingering Lightning, despite the fact that it's an implement power, because it applies weapon damage. Honestly, the description of it sounds like more of like an implement power, and doesn't sound like you are actually hitting with the weapon, but that doesn't change the fact it applies weapon damage.
For Sword Burst, I think this clearly falls under the opinion I gave earlier. No, for High Crit property.
For Spidersilk Slash, I can see how it's debatable. I'm going to rule no for High Crit property with it, but I do so with some reservations. I am leaning towards that being closer to the RAW. However, if I had a player argue for it, I think that I'd let them have it just because it is subject to debate.
If when confronted with 2 interpretations that are both reasonable and valid, I say it's better to choose the side that your players want and not worry too much about if you're right.