Question: I can't work out if the beholder staff is better than the draconic magma staff for summoner DPS. My efforts to test this have been ... less conclusive than I would like, because of difficulties getting a reproducible test-case for minions to damage, given piercing and so forth.
The items themselves are 26 damage per dragon minion, and 38 damage per beholder, but beholders take two slots, so at that level it's clear that 2 x dragon is better than 1 x beholder if (a) I don't care about the extra feature of the beholder, and (b) they both attacked at one attack per second.
I'm not sure they do, though. The wiki is sadly silent for both vanilla and thorium about what the attack speed of minions is. Is it tied to the use speed of the item, or separate? If separate, what are the attack speeds for the Thorium minions?