What tier is Caustic Cassiopeia on TFT Set 18?

Caustic Cassiopeia is currently Tier HM on TFT Set 18, with a 5.96 average placement and 24% top 4 rate over 166 real ranked games analyzed.

TFT Set 18

Caustic Cassiopeia= 0.04

Level 8

Placement

5.96

Top 4

24%

Contest.

This comp was Tier C in a previous refresh (last seen Sep 14), but doesn't get enough recent games to stay actively ranked this cycle. Kept here for reference.

Full composition

Traits

Coven 4/5

Vanguard 4/6

Invoker 3/4

Ravager 2/4

Spellweaver 2/4

Caustic 1

Flora Fatalis 1/2

Elderwood 1/3

Adaptor 1/2

Riftbeast 1/3

Lunar 1/2

Defender 1/2

Item combos — main carries (top 10)

Elise

Combo	Avg placement
	5.00
	3.00
	7.00

Cassiopeia

Combo	Avg placement
	4.73
	5.43
	6.00
	5.33
	5.33
	5.67
	6.67
	5.00
	4.50
	7.50

Seen on the TOP ladders

NA Darth Nub#NA2 CHALLENGER 925 LP 1

EUW ViggoZe#EUW CHALLENGER 1322 LP 2

NA CtHin#NA1 CHALLENGER 609 LP 5

KR ruoved#디바우어 CHALLENGER 782 LP 6

EUW G1nkgo#2002 CHALLENGER 1029 LP 7

NA Broseph#LAB CHALLENGER 974 LP 8

Matchups vs

vs Caustic Aphelios 23 encounters 48%

vs FloraFatalis Azir 15 encounters 47%

vs Caustic Nidalee 15 encounters 53%

vs Riftbeast Pebbles 11 encounters 27%

vs Summoner Zyra 11 encounters 55%

vs Emerald Ahri 10 encounters 30%

vs Emerald Morgana 9 encounters 22%

vs Elderwood Ezreal 9 encounters 33%

vs FloraFatalis Ezreal 9 encounters 33%

vs Juggernaut Zyra 9 encounters 56%

vs FloraFatalis Kha'Zix 8 encounters 38%

vs Juggernaut Sivir 7 encounters 71%

vs Greenfather Ezreal 6 encounters 67%

vs Invoker Morgana 6 encounters 67%

vs Defender Cassiopeia 6 encounters 33%

vs Greenfather Amumu 6 encounters 67%

vs Invoker Ahri 6 encounters 67%

vs Executioner Kha'Zix 6 encounters 33%

vs Executioner Soraka 5 encounters 40%

vs Spellweaver LeBlanc 5 encounters 60%

Board variants

Baseline

4.67 avg placement

→

7.44 avg placement

→

4.50 avg placement

Real versions of this comp's final board: which exact group of champions shows up together, how often, and the average placement of those games. Not a game-by-game history (Riot only exposes the end-of-game board, never how it got there): a comparison of builds, not a timeline.

Board add-ons (9th/10th unit)

Base board — 9 units Not enough games with exactly this board, no add-ons

Not enough games with an extra unit for a reliable signal.

The main board above stops at 9 units: reaching a 10th slot needs level 10, which on its own already correlates strongly with a good placement. Below, the average placement of games with this base board plus one or two extra units, shown as a correlation to interpret, not a causal recommendation.

Augment path

Data unavailable. Riot's API doesn't populate the augments field for this set — verified directly on the collected sample (the "augments" field doesn't even appear in the response, across 23,000+ real participants checked). The field does exist in the official schema and worked on older sets, so this probably isn't permanent — this section will activate automatically as soon as it fills in again.