[ OOC: So, I had to recheck the math a couple times to make sure that this was correct (which I'm still not entirely sure about, so feel free to check and/or correct me on this as this is delving into an area of the math that I'm not as familiar with) but according to<a class="postlink" href="http://www.d20pfsrd.com/gamemastering/combat#TOC-Combat-Maneuver-Defense">this</a>summary of all of the bonuses that you can get, Aethon's CMD against grapples is 25 right now - 10(base) +5(BAB) +0(Dex) +4(Str) +2(Size mod for being Huge due to his<a class="postlink" href="http://www.d20pfsrd.com/classes/core-classes/cleric/domains/paizo---domains/plant-domain/growth">Enlarge domain ability</a>) +2(Improved Grapple) +2(<a class="postlink" href="http://www.d20pfsrd.com/magic/all-spells/m/magic-circle-against-evil">Magic Circle against Evil</a>deflection bonus) ]<br/><br/>Watching as the mermaid reels from his and Dusk's attacks, then promptly begins pulling in water from the surrounding area, Aethon realizes that he is going to need to increase his own abilities further if he's going to continue to stay in the fight, as most of his more beneficial magics were still uncast.  Barely slipping free of the suction her increased size is causing, he moves back from her then launches into spellcasting.  At the completion of the spell, his already-large muscles swell even further as he turns back to the mermaid.<br/><br/>[ Maintaining Enlarge, then five foot step (or whatever the equivalent is when you're swimming - backpaddle?) away from the mermaid and casting<a class="postlink" href="http://www.d20pfsrd.com/magic/all-spells/b/bull-s-strength">Bull's Strength</a>on himself, which will raise his CMD to 27 (among other things). ]