i first saw this little exploit in game and never really realized what it was or even if the person i was playing knew he was using it. the basic bug/exploid is in the map, Exile the crystal is so close to the edge of the path that its arera of effect actualy crosses into that of the adjasent lane.
this bug has been documented and complained about before however the one posting it did so in such a ZOMG!@! WALL OF TEXT!!! manner so that everyone just thought he was crazy (Post HERE). i come to you today not in complaint (because i don't think enought people know about it to exploit it) but as to inform GPG that the bug exists and would be good to change.
like mentioned the bug involves the proximity of the crystal to the edge of the path. below is a normal player next to the crystal in base:

notice the ever increasing amount of mana above erebus's head (+32) that is sustainnig his mist.
next we have the lane just to the sidewhere the same erebus is also using mist:

notice the faint windy lines reaching from the crystal as wellas the mana above his head? thats right he's getting charged by the crytal.
i also checked to see if this was side specific... and it is not. here is the light side for those who care:

Again erebus is getting mana from the crytal.
so why is this a game breaking bug? well its not really but its not how the developers intented i'm sure. with the area extending into the lane it means that DG's don't have to go all the way back to base to recharge. this is perticularly broken when lanes are pushed this far back and defenders are gettign an extra 32 mana and HP every half second.
another way this can be exploited is like the pictures suggest with erebus and mist. now i'm sure ur asking your self, but perma mist erebus is a legit built... why is having one next to a crystal any diffrent. well this is quite simple:
normaly to build up enough mana regen to sustain mist perminantly it takes around 19000 gold... however if you on the crytal the constant flow of mana actualy causes another bug where erebus's mana reaches zero but doesn't break mist since it is bumped up to 32 every 1/2 sec. here in this next picture you can see a level 1 erebus in perma mist with zero mana:

bugged.. i think so.
anyway this is an informative post directed at GPG so they can get on fixing the problem. my suggestion would be to switch the position of the crytal and shops with the gold mines. this wouldn't add any more travel time for retreating demigods and would make sure the area doesn't cross into the lane.
i also don't condone anyone using this info to exploit in game. if you are consciously using this exploit to try and get the upper hand i think you should be ashamed of you self and if you see anyone doing this be sure to screen shot and post on the HALL OF SHAME post.
that all for now, let me know what you think or if anyone has any other suggestions of addition to this bug. 