Tier 1 Items Healing rite first if you're struggling. Otherwise a typically good order is high-velocity>infuser>healing rite>HPW>Extra Charge>Extra Spirit>Monster Rounds>Mystic Vuln>Sprint boots>Enduring Spirit You can go mystic burst if you really want some juicy grenades but not mandatory! Definitely go mystic reach instead of extra spirit in to stuff like gray talon or vindicta.
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The support stuff
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RUSH THIS ITS OP (BEAM)
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Situational Suppressor against stuff like infernus haze wraith etc., hex vs. mobile chars. Armor is self explanatory, healbane in to stuff like abrams or mo and krill. Fleefoot if you need mobility and to start pushes.
Mid Game In the midgame prioritize filling up your slots while pressuring the map. If ahead, prioritize buying Rapid Recharge and Improved Burst.
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Late Game Decide if Spirit or Weapon damage is better with your team and enemy resistances
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Situational Mystic Reverb for slowing and poking, Boundless Spirit for power and healing, use Echo Shard right after a grenade, Siphon bullets for ultimate damage + sustain item
Category 1 Extra Charge, Healing Rite, Mystic reach always. Rest as needed for lane (buy like 6 500's minimum)
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Category 2 Health nova + divine barrier first. Then save for rescue beam, and get healing booster after. Then CDR + save for Refresher (or buy some more 1250's if you need to be stronger earlier)
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Category 3 Refresher first, then upgrade your spirit items for 3000 souls. Cooldown + Duration imbue Ult, Improved reach imbue your 1. GG
Category 4 Dont get healbane if there isnt enemy's with high lifesteal or healers. Imbue Improved reach on beam or nades, but you should probably do beam.