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Message: <blockquote data-quote="Aeric" data-source="post: 2873860" data-attributes="member: 17012">I type too slow, but I'll post this anyways. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile    :)"  data-smilie="1"data-shortname=":)" />Using a spell-like ability provokes an Attack of Opportunity, but casting a quickened spell does not.I don't know if Casting on the Defensive applies to spell-like abilities, but if it does, then the first Concentration check the baddie needs to make is to avoid provoking any AoOs while using his spell-like ability (DC 15 + spell level).  If he fails this roll, he is subject to AoOs.If he is hit, then he needs to make another Concentration check (DC 10 + damage dealt) in order to successfully use the ability.  In this case, the check DC is an incredible 63--unless the baddie is epic level, there's really no way he's going to succeed.There's also the issue of death from massive damage.  The baddie has to succeed at a DC 15 Fortitude save or die.  If the baddie makes this save--and if your players are throwing around attacks that do 53 points of damage, chances are that he will--then his quickened spell goes off without a hitch.In regards to your specific questions:1) Should the number of surrounding opponents, crit, damage, number of hits, or number of actions, he takes have any influence on his spell?The only thing that will interfere with his ability to use the spell-like ability is whether or not he makes the Concentration checks covered above.Nothing should interfere with his quickened spell, unless he dies from massive damage.2) Does a failed concentration check trigger an AoO as well as losing the spell?As mentioned above, there are two Concentration checks involved.  The first one is to avoid AoOs; failing that one earns you AoOs from anyone in range, but does not cause you to lose the spell.  The Concentration check that causes you to lose the spell is the one you make after you've taken damage, but you do not gain additional AoOs on top of that, no.AoOs are tricky business.  Hope that helps clear things up a little!</blockquote>

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