MAD Gish question
I've been wanting to play a gish that basically breaks down to Wizard 15 (bladesinger), paladin 2, sorcerer 3. As a custom lineage or half elf drow using shadowblade as my main weapon. Using quickened spell from metamagic and extra attack from BS I think it would essentially come out to doing bonus action quickened booming blade 5d8 shadow blade + 3d8 booming blade + 5d8 divine smite 22.5 + 13.5 + 22.5 = 58.5 our action then dittos our bonus action's dmg giving us another 58.5 or 117 then we do one final normal shadow blade attack using blade singer extra attack to continue off a cantrip but we lose booming blade damage giving us 22.5 + 13.5 = 36 giving us 58.5 + 58.5 + 36 = 153 as a nova
Assuming even if we're MAD we could reasonably get STR 13, DEX 19, CON 10, INT 18, WIS 8, CHA 14 using half elf for +2 cha and +1 to any two other scores and the 3 ASI's from wizard I know CON is low but we can also reasonably be well defended by using good armor and we have access the shield spell which is +5 ac I'm sure I've built this somewhat unoptimized so what is someways I could fix that or make this build overall stronger