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Hasai is a good secondary supporting monster so Team Speed runes work well with him.
Crystal Bash (45 Special dmg + Blind + Damage Reduction, 31s, 0 CD). Trigonal Light (AoE 35 Light dmg + PER, 37s, 3 CD). Gemstone Barrier / Gemstone Remedy (Barrier for Ally 50% Shield + Precision + Damage Boost, 30s, 3 CD) / (Remedy for Team 30% Shield + NER, 33s, 3 CD). Crystal Strike (50 Special dmg + Stun, 28s, 0 CD). Recommended Moveset Blinding Light (Mixed) Access to 4 negative effects and 3 positive effects. Also, he can buff your Attacker with Shields, Precision, and Damage Boost to make the job of killing your foes easier. He can be kinda versatile with low cooldowns and good deny/debuffing moves. Hasai has mediocre stats, skills and trait.