Overview: There has been a major greifing of the server, this includes lava pillars, and some random towers.  The scene of the incident was, Wild one, wild 2, Maybe unrelated Spawn point.
Suspects (found by logblock and screenshots): bioniclepoop, waterflow (unregistered? my theory below),3PIKman, davespavid.
What i did: I investigated the scenes and looked around when i singled out those for people i jailed them just so they focus on the questions i had for them.

Davespavid: said he only saw the greif after but logblock said he placed a dirt pillar at the same time as the greifing at both wild 1 and 2
3PIKman: said he griefed but only placed blocks, not the lava
WaterFlow & bioniclepoop: First i paired these two up because i think they are the same people, bionicle was the only one that didnt appire in jail, he was in the middle of a swamp, but when i did /whois bionicle it said jail was true and i said type /spawn he said he couldnt. I think he was able to access the protected areas because he hacked. Also proof he might have hacked, people could place lava down but before the grief no one could besides staff and up.

screenshots: here are the original post by acerbus555 about this greif

• http://kraftzone.tk/forum/index.php?topic=279.msg1087;topicseen#new
•   http://kraftzone.tk/forum/index.php?topic=281.msg1089;topicseen#new      
• http://kraftzone.tk/forum/index.php?topic=280.msg1088;topicseen#new
• for spawn: http://kraftzone.tk/forum/index.php?topic=278.msg1091;topicseen#new

also a message by acer to me (and koolio) with screenshots and here is what he said:

I have a few screenshots of a small group of players talking about griefing small unprotected towns, but also, that same night there was ALOT of grief at the wilderness spawns, and in wilderness 2, I feel like the one named Davespavid was involved in the griefing of the wilderness spawns, the others were just griefing small towns. Throughout the whole night though, the one named davespavid was glorifying his skill with lava grief, and saying he had a whole inventory full of the stuff. This is why I suspect him, and that Bluedudex2 said his name showed up on whatever the antigrief tool it is that he uses. Sorry if these end up being useless, I'm just trying to help.

But with the screenshots, i would have not found the four people and i only had Waterflow (usless because he is unregistered according to austin and a few other players) and davidspavid, and after i confronted him with this info he was enraged saying they are fake and im bad staff for making up these screenshots but me and koolio have a copy of them. And before my minecraft froze (like usual) i muted him but i accidentally muted him for an hour but i was typing so fast that i didnt do 10m.

For now i thought the best thing to do was keep them jailed just in case it was them so they couldnt greif (spore1-3 has them) and also so koolio can decide there fate, but i have to admit i could have done more but i am really tired and need to go to bed before i fall asleep on the keyboard and i was limited and when i tried to see who placed down the lava it said no results found, if i could have i would have rolled it back when i was on but i cant 🙁 .

This is the end of my report.