First of all - after recent updates new type of crystals have been introduced: speed crystals. They are a rare drop, but when dropped, they may be placed in any tool and give bonus to speed. I was given lvl.81 crystal that gives +10 to speed. Some of players spend almost all their time hunting monsters and searching for those new crystals.
Player D. told we still have time to produce marble bricks: so I abandoned my obsidian work and switched to marble. At first, situation was very favorable:all veins nearby and unguarded. I was able to make some 1700 bricks and transport them to storage silo. Second run was not so succesfull: veins were a bit far away and I had to avoid some of nearby golems, but still made some 800 bricks. Third run was in a non-efficient place. I wanted to harvest Rich node (it may give up to 750 resources), but was noticed by two golems and killed.
I returned, took my cargo disk and managed to make some bricks. Unfortunately, Player D. did not invest all his time into harvesting. He is a Dragon, therefore he could fly and reach silos faster than I could. So, i abandoned my crafting, mainly due to very inefficient situation. Left silo with some 4000 bricks and the hope that Player D. would harvest all marble he could find.
Then had to help one friendly Dragon's human character. We went to New Trismus and hunted tens of maggots for crystals. When used, those give both combat and crafting xp, so Player D. alt advanced quickly.
Yet another plot is being deconstructed: the owner either abandoned it or sold to the lore. One player showed interest in it, but I'm not sure if she would buy that plot.
Overall the day was succesfull: I am lvl. 82 Mason now and will advance with marble harvesting, if Player D. cooperates with me more actively.