i played chaidou as lightmage on a public lobby today, and there’s a few issues to note:
the spectre mask is incorrectly set as tier 0, so you get a spectre mask as a starter item. aside from the massive defense and damage increase, however, i really appreciated the extra mana in the earlygame, and suggest adding a weak gem robe + hat as the lightmage starter armor.
i managed to get the new lunar flare on wave 8 by saving up a little, having only bought ancient cobalt armor and tome of infinite wisdom, even though i was playing with randos that did not optimize for point farming.
lunar flare was overpowered on waves 8-10, but the high mana cost made it a decent at best loose cannon that i used to pick off snipers and brain sucklers in the later rounds. maybe add another tier to weapon chest 3 to ease the progression into the midgame a bit better?