Cleon
Legend
I guess I can go for all those equivalences.
So do you prefer slow or confusion for the psionic blast equivalent?
That's a difficult matchup, because all the SRD spells that stun creatures are rather high level.
Upon second thought, we should use the same solution as the 3E Mind Flayer — give it a Mind Blast SLA:
Mind Blast (Sp): This psionic attack is a cone 60 feet long. Anyone caught in this cone must succeed on a DC 17 Will save or be stunned for 3d4 rounds. Mind flayers often hunt using this power and then drag off one or two of their stunned victims to feed upon. The save DC is Charisma-based. This ability is the equivalent of a 4th-level spell.
I'd prefer to down-power it a bit to match the 3E psionic power. If we make it different from an Illithid mind blast we ought to consider renaming the power though.
How about:
Psychic Blast (Sp): This psionic attack is a cone 30 feet long. Anyone caught in this cone must succeed on a DC X Will save or be stunned for 1d4 rounds. Monarch scorpions often hunt using this power and then drag off one or two of their stunned victims to feed upon. The save DC is Charisma-based. This ability is the equivalent of a 3rd-level spell.
I do actually think displacement is a better match to greater concealing amorpha, but the option for the two invisibility spells works very well.
Yeah, displacement is a more literal interpretation of greater concealing amorpha, but the lack of a "lesser displacement" with the same 20% miss chance of regular concealing amorpha makes it a bit more tricky.
Hang about, there's an obvious alternative:
concealing amorpha => blur.
greater concealing amorpha => displacement.
That said, the main reason I was using invisibility was that was the name of that particular psionic devotion in the original AD&D Monarch Scorpion, so using invisibility as the SLA seemed a bit closer to the original.
Only a bit though, since the AD&D version of psionic invisibility worked a lot differently to the spell version. The former targeted creatures and telepathically convinces them they cannot see the invisible subject(s), requiring a separate Power Check for every creature-subject match. That made it a lot weaker than spell invisibility.
That distinction is a bit academic for our purposes, since none of the spells under consideration are mind-affecting.