652Graystripe
Plantera
Grecian Automaton
-All modes
-80 health
-15 defense
-45 damage on hit
Killing two birds with one stone. This little jerk'll flit around the marble cave, bat-style, trying to turn you into meat loaf. It's not particularly dangerous, thank Christ, but it's a little annoying through virtue of being the tankiest goddamn bat out there.
It drops 10-20 marble blocks when you kill it, so that's the marble renewability problem solved. It can also give you this little thingy...
Forgotten Scepter
-Throws sentient, ghostly javelins to chase down your foes
-Costs 15 mana
-29 usetime
-2 knockback
-18 summoning damage
All credits to @Pinelord again for the whole "summoning weapons" concept. I'm just gonna keep plugging his work, guys, so summoning weapons ain't going anywhere anytime soon.
Lastly, summoning associates. @crackshotCerberus @Brick Creeper @Darthwikia25 @Buggsy1O1