Added to Homebrews.
I borrowed the constrict entry from the gray ooze as well. I think the added difficulty to the DC seems apt here as well.
For the sample weapon, how about a morningstar?
Feats: 2
Weapon Focus (slam)? Stand Still?
Once again, 'tis a shame that Improved Grapple has Improved Unarmed Strike as a prereq.![]()
I'd have it do more damage with the Constrict, maybe slam plus 2d4 acid, since the original does a respectable 2-12.
Nothing to stop you giving it a racial bonus or bonus feat for the +4 grapple.
I'd go for the racial bonus.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.