actually good geist build
Building every item in order is fine but especially as you get more comfortable you should buy based on the game and personal preference. The build is made to be accessible to new players but is also very good at "high mmr". I took a break from the game but the build should still function well with minimal changes.
core 500s
geist's 500s are flexible but these are always great
Mystic Burst
Buy this asap, it just adds 35 damage to your bomb.
Mystic Expansion
Mostly a "nice to have", if you want to build Suppressor/Mystic Slow you can skip
optional laning items
sell later
damage core
Fleetfoot
Move fast, don't get slowed when shooting, all around good item. Buying it early makes your rotates faster.
defensive core
mid-lategame core
build cooldown items and get tanky
Tankbuster
You can build it even sooner as long as you have T2 Bomb, it will basically always proc it.
Leech
Your best item.
Spirit Resilience
You take significant self damage so buying more spirit resist is important.
Superior Cooldown
Imbue on 1 (Bomb), also OK on 3 (Malice)
super lategame
sell mystic reach
Item 869090587
Imbue on 1 (Bomb) - Improved Burst proc feeds into the Reverb damage. 3 (Malice) also OK for more consistent slows
Escalating Exposure
More damage more spirit resist
Item 4003032160
This item got nerfed, but it's still great lategame as you can die and ult after for huge swings in teamfights
optional / lategame
sell your remaining 500s for these
Suppressor
Mystic Slow
Ethereal Shift
Return Fire
Healbane
Debuff Reducer
Dispel Magic
Unstoppable
Surge of Power
Knockdown
Point Blank
Warp Stone
Metal Skin
FrenzySuppressor
Good early vs. left clickers
Mystic Slow
Probably her best non-core spirit item, just gives some utility to your bomb pool.
Ethereal Shift
Very good post-buffs. Also Ethereal Shift DOES NOT CANCEL LIFE DRAIN
Return Fire
Buy vs. left clickers (Haze)
Healbane
Buy vs. healing.
Debuff Reducer
Decent to buy early vs. many debuffs.
Dispel Magic
Must buy vs. Decay (and Pocket), and Silence
Unstoppable
Buy if you're getting focused by a ton of cc.
Surge of Power
Go fast. Put it on 3
Knockdown
Buy vs. Seven or Vindicta (or anyone annoying enough)
Point Blank
Good armor item if you have flex slots. Stamina, slow, damage, everything here is good.
Warp Stone
Warp was a core item before, but now I think Fleet is better, cheaper and comes online earlier. Still good for juking and ulting
Metal Skin
Alternative to return fire, usually better but more expensive
Frenzy
You can skip bullet armors entirely and just go Frenzy if you want
Untitled
Generally you want to prioritize the optional items (on the left) over Reverb/EE. Green items are generally best because +%HP is the most valuable. This build also has a thread on Discord if you want to discuss it.