Staff of Thunder and Lightning
Staff, very rare, requires attunement · 2014 rules, SRD 5.1
+2 quarterstaff; once per dawn each: Lightning (+2d6), Thunder (stun), Lightning Strike (9d6 line), Thunderclap (2d6 + deafen), Thunder and Lightning (both).
Also in the 2024 rules (SRD 5.2).