TFT Set 18 Riftbeast Ascension Comp Guide: How to Play the Fast 8 Riftbeast Build (Patch 18.1)

Riftbeast Ascension is a Fast 8 comp for TFT Set 18 Patch 18.1. Full guide: the leveling route to level 8 at 4-2, BIS items for The Elder Dragon, Pebbles, Ancient Sentinel and Brambleback, and how to activate Riftbeast 7 as fast as possible.
TFT Set 18 Riftbeast Ascension Comp Guide: How to Play the Fast 8 Riftbeast Build (Patch 18.1)
Riftbeast Ascension is the definitive Riftbeast comp in TFT Set 18. Curated by Challenger players on Patch 18.1, this Fast 8 build stacks the Riftbeast trait to seven, with Brambleback, Ancient Sentinel, Pebbles and The Elder Dragon as the main carries. The trait upgrades your Riftbeast units every round, so the whole plan is to hit seven Riftbeasts as fast as possible and let the free upgrades roll in. Here is the complete breakdown, based on the latest curated guide data.
The finished board is: The Elder Dragon, Ancient Sentinel, Brambleback, Pebbles, Gnar, Taric, Krug and Murkwolf. The key traits are Riftbeast 7 with Vanguard 2, Brawler 2, Ravager 2 and Invoker 2, plus the Emerald Aspect and Apex Predator single activations.
The benchmark route is: level 4 at 2-1 with 5 or more gold, level 5 at 2-5 with 10 or more, level 6 at 3-2 with 30 or more, level 7 at 4-1 with 50 or more, then push to level 8 at 4-2 with 30 or more gold left to reroll for your carries.

In the early game, play around Riftbeast 3 with Juggernaut 2, featuring Scuttlecrab, Pebbles, Cinderling and Rakan. Level up to 4 on stage 2-1 and look to win streak, and put your Alpha Mark on Scuttlecrab. In the mid game, level to 6 on 3-2 and add five Riftbeasts so your units upgrade without rolling, then aim to activate seven Riftbeasts as soon as possible.
The Elder Dragon, your main carry, runs Hand of Justice, Infinity Edge and Last Whisper. Pebbles, the most important three-star Riftbeast, holds Rabadon's Deathcap, Jeweled Gauntlet and Blue Buff. Ancient Sentinel anchors the frontline with Warmog's Armor, Protector's Vow and Sunfire Cape, and Brambleback runs Quicksilver, Edge of Night and Giant Slayer.

The guide's when to make criteria are: hitting a Riftbeast opener and having an economy augment.
Four details make this comp shine. First, The Elder Dragon takes up two team slots and grants plus two to the Riftbeast trait, so plan your board around it. Second, put your Alpha Mark on The Elder Dragon. Third, pair Taric with The Elder Dragon in the frontline. Fourth, the most important three-star Riftbeast is Pebbles, so prioritize rolling for it. Hit level 8 at 4-2, roll for your two-star carries, and let the Riftbeast upgrades snowball the late game.
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