Deepspawn

 
Prerequisite(s): Aberration Blood, one other Aberration feat.
 
Benefit: Two short but powerful tentacles sprout from your waist. You gain two tentacle natural attacks (1d4+ Str mod). The tentacle attacks are considered primary weapons. You can attack with weapons and also make the tentacle attacks as a secondary attack at a -5 to hit, and you only add 1/2 your Str check. You also gain a +2 on grapple checks.
 
Source: Lords of Madness