Alright, I don't really know how to format stuff on this site, so, here's a copy-paste of the second boon for Sentinels of Gorum.
Two-Handed Smash (Ex) If you make a full attack while wielding a two-handed melee weapon, you may make a single unarmed strike in addition to your normal attacks. In essence, after you complete your two-handed weapon attacks, you smash with your elbow, kick out with a foot, or make some other unarmed strike against an opponent. This bonus attack is made at your highest base attack bonus, and provokes an attack of opportunity if you lack the Improved Unarmed Strike feat or a similar ability. If you’re Medium, you deal 1d6 points of damage with this unarmed strike; if you’re Small, you deal 1d4 points of damage. Add half your Strength bonus to the damage dealt. The attack roll for the unarmed strike is subject to the normal penalties for two-weapon fighting unless you have the feats to reduce these penalties.
Is it just me, or is that the single worst ability in the entire game (outside of maybe Elephant Stomp)? Like, yeah, an extra attack on a full attack is pretty nice... but it provokes an AoO? And "normal penalties for two-weapon fighting" implies to me that the attack takes at least a -6 penalty, more likely a -10. Of course, you can take feats that mitigate this, but if you're any kind of normal beatstick, why would you ever take Improved Unarmed Strike or Two-Weapon fighting? That's like Spell Focus on a fighter. Has this been addressed or erratta'd?