How do you defeat the Legendary Tiki and Halloween Myrrh Combo?

No, I don't.

But I guess obe could build a high atk unit with armor effective weaponry and adequate colours such as Bartre + Est or something like that.

Agreed, it's not something I'd run on my arena core but specific AA checks, but it's doable.

L!marth + Titania pretty much slaughter any dragon.
Alm can also slaughter them on PP strictly.

Sheena for Tiki and Effie/Roy for Myrrh. Although this week, my own L!Tiki can kill both of them.

Simple. Have a better L!Tiki. I don't want to even imagine going up against the two of them without L!Tiki. I could let my cheerleaders eliminate them, but they aren't bonus characters :/.

At first it was great to have lavatein as a bonus unit as it was extremely funny to slaughter down everything with her..
This week running L!Tiki and H!Myrrh is even more fun but seriously insane. Basically the one above was right saying you need a better L!Tiki. ;)

Refined Alm with DB3 kills a whole dragon emblem team with a healer and a dancer (or just dancer if you play it slow)

Having Divine Mist effective against dragons makes L!Tiki a very very hard to kill unit without a green res tank. Also her speed is outragerous, so she will be doubling you eaither phase. I could suggest Camilla, and a Reinhardt to kill Myrrh, but L!Tiki is going to be very hard to play around.

+10 Regular Myrrh takes care of L!Tiki. And her costumed self (even with -atk, +spd) takes care of literally everything else. I just had my best T20 run ever, sitting at 3699! Might be enough to stay for the first time.

Bartre. Deirdre. Julia. Chrom. Tiki.
In fact, any armorslayer or dragonslayer.

I'm not sure about arena, because bonus unit kills complicate things. Sheena is good against L.Tiki to whittle down her health. H.Myrrh has trouble with Fjorm. Both of them will feel the hurt if you put slaying spears (NB not slaying lance but the anti-armour weapon) against them. Even slaying hammer is not bad if your res works or if you have desperation because Myrrh is pretty easy to double

I’m a F2P player and luckily pulled both of these with pretty good IV’s. Tiki (-Spd/+Res) H!Myrrh (-Spd/+Res).

With them I’ve finished every stage of the story maps, hit Tier 20 for the first time and so far this season can just play them in front & rack up +12 every battle. It’s incredible!

I... Actually survived that once. Had my Saias debuff all of their stats, and then had them attack my masked marth +8 and abused their refined falchion to barely survive. It definitely helped giving her flashing blade 3 s seal and sol