Re: Does anyone have any idea why this is legal?
We all know stop sign powers. This is a stop sign player.
This is all complete conjecture, and I mean no affront or offense to the player, And if I'm wrong, I put forth nothing but the most vehement apologies. That being said, my READ is that he's the sort of person who takes pleasure in derailing plans. Going where the GM doesn't intend, not to further the plot but derail it- Like the previous "going for chinese food" example, only dragging everyone along and making up his own adventure- "Hey guys, let's go move the Terra Cotta warriors around backwards!". I also see them murdering BBEGs while they're giving their introductory speech, and reveling as the GM sputters as his tenth straight adventure was run off the rails in five minutes or less, or your pizza money back.
On the first build? I can completely imagine them talking to some shady but public figure, a mob boss or sinister corporate executive, and then going ahead and saying, "I invisibly head asplode him." and grinning like a jackal as they scoop up dice to fry your plot thread.
The second build seriously says to me that he's going to 'surprise grab people' since "They can't see the tentacles until it grabs them, since it doesn't cross the space in between- shouldn't they all be at half DCV?" , then try his EDM-and-drop maneuver, which thankfully we have a hole for. I'm guessing he'll define the other dimension as full of scary, flesh-rending beasties, but otherwise just like here, so he saves points on Life Support.
This is the CN "psycho killer" Barbarian, the Shadowrun character that needed a cortex bomb to prevent them from blowing the party up on a lark. Be very, very careful.
(Also, unless you have, say, The Catholic Church running around exorcising demons, or a bunch of prominent Divinely Powered superheroes, "Divine Power" is NOT Common enough SFX in my opinion. I had a character with a Shadow Form build effected by Light, Lasers, and Magic SFX. Just something else on the pile.)