The “Quick TL;DR” guide series:
I’ll get straight into it.
PSA #1: A Support is like eating a hotdog with no condiments. Yeah, it’ll still taste pretty good, but why eat a pretty good hotdog when you can eat a bomb ass hotdog instead?
PSA #2: Both Diona’s abilities scale off ATK. While her shield and healing do scale off HP, it’s fairly low and not worth the investment. Literally everything about this character is a cat lovers wet dream
Diona shoots out cryo cat paws that home in on enemies. Grants a cryo shield on hit. STAYS WHEN YOU SWAP CHARACTERS. Number of paws hit = longer the shield lasts. Applies cryo to self for a tiny bit when shield forms
PSA #3: The base duration of the shield is around 6 seconds (more like 5.6s), so each paw hit will add (at level 8) 2.4 seconds to it. Here’s the quick rundown:
Tap E to shoot 2 paws that gives you a 10s shield (6 + 4.8s [since 2 x 2.4s] = 10.8s shield)
Hold E to shoot 5 paws that gives you an 18s shield (6 + 12s [since 5 x 2.4s] = 18s shield) BETTER OPTION
IMPORTANT TIP: THE PAWS DO NOT TARGET SEPARATE ENEMIES. THESE CAT PAWS ARE DUMB AND WILL JUST ALL HIT THE SAME TARGET HALF THE TIME.
Shield makes you zoom zoom and stamina drains less (works with dash)
Diona kicks a cocktail shaker at her enemies. Does AoE cryo damage on hit and puts down a cryo field. Enemies in cryo field take cryo damage over time. Characters in the field heal
Enemies do less damage when in the cryo field
WEAPON 1 (Recommended for rush hour service): Sacrificial Bow
How do I get it D: ?: It’s time to roll boys (gacha)
Has base Energy Recharge scaling and makes Diona’s E A LOT more forgiving
PSA #4: YOU CAN RUN ANY OF THE DAMAGE ORIENTED BOWS AS WELL. Sacrificial Bow makes holding E much more forgiving and helps to extend the shield duration. Favonius Warbow is a strong contender, and does better than Sacrificial Bow if your goal is to turn Diona into an energy orb slot machine
WEAPON 2 (Recommended for that hangover early in the morning): Prototype Crescent
How do I get it D: ?: Forge (Prototype x1, Crystal Chunk x50, White Iron Chunk x50)
Has base ATK scaling and weapon skill feels nice to open up with Diona
Slingshot is also an incredibly easy placeholder weapon as well. If you don’t have either, by all honesty, Recurve Bow is also a solid option early as it’s 1) free to get in chests and 2) it provides HP scaling to make the shield and heal stronger
ARTIFACT 1 (Recommended for a drink on the rocks): Noblesse Oblige + Maiden Beloved
How do I get it D: ?: Noblesse Oblige at Clear Pool and Mountain Cavern Domain (AR 35 locked, 20 Resin per run). Maiden Beloved at Valley of Remembrance Domain (AR 30 locked, 20 Resin per run)
Makes Q do more damage (both explosion and tick)
Makes Q healing much stronger
Feel free to also run two 18% ATK+ sets, or 4-set Noblesse as it turns her into an ATK buff mule (sort of like a weak cryo version of Bennett Q)
ARTIFACT 2 (Recommended for early brain freeze): The Exile
How do I get it D: ?: Any World Boss (40 Resin per run), or go steal some chests
Ever see a cat poop out energy? You want to?
PSA #5: For those wondering, stacking HP stats is not worth it. Like any support, you still want to have damage on them as it will provide more mileage with elemental shields later. Diona is fairly consistent, but still gets massively outclassed by Qiqi in cryo application, healing, and damage (still worth getting her if you desperately need a cryo user other than Kaeya)
Main stats: ATK% Sands / Cryo DMG% Goblet / Healing Bonus% Circlet
Substats: CRIT% > CRIT DMG > ATK/Elemental Mastery > HP%/HP
If you want other characters let me know!