Neit cast dimension door as a move action, costing 13PP.
She failed the grapple above, and thus takes 1d6+4=8
damage from the tentacles.
The concentration test to cast another power whilst being grappled, however, was passed
Neit overchannels to perform 2 levels higher of a power, and takes 3d8=15
This in turn lets her perform the ranged version of Empathic Transfer, Hostile, for 11PP.
Everybody within 20 feet takes 50 damage...
Apparently none of them have HP over 50, so even if they make will saves, it's still insta-death. So they all die, except for that one gobbie who is more than 20ft away.
...and, also, Neit thus gets her full 72 HP back. Since Empathic Transfer.
Total PP spent = 24.