Wisp immune, Fairy resist, and makes the matchup into Moltres easier (Stone Edge could miss or they could predict and go into it on a CC or whatever). Tera Ice and Fire are the only two I’ve tried so far, so I would be wiling to try other teras. Dark sounds interesting and I might try it, but I can’t imagine wanting to turn my Zama into a Dark type in many situations. Maybe vs Sinistcha? If I have a problem with Ms. Matcha I’ll try it.AV Zamazenta is super underrated right now, it does extremely well into traditional Bulky Offenses that rely on those Landorus/Gliscor/Tusk + Kingambit + Glowking cores. The Tera fire can definitely be substituted for Tera Dark which I normally use to break through easier vs Glowking and Gholdengo. Also I don't think the Tera Fire is that great on this set since you aren't beating Iron Valiant with this anyways due to no Heavy Slam, and the burn immunity doesn't matter too much when you threaten the OHKO on Moltres as is so it only affects the matchup against Dragapult who already struggles to break through AV zama (let alone with Tera Dark). Maybe there's something I missed about Tera Fire for AV Zamazenta, if so let me know but yeah this set super threatens Bulky Offensive and basically all non Alomomola balance teams.