Alcaster at first seems like a run of the mill caster hero. However, after level 6, Alcaster's breaks the mold and becomes a powerful spam caster. With his ultimate - Resonating Power - Alcaster can recast a recently cast spell. This allows Alcaster to greatly increase his damage output and threat in team fights.
Siphon completes this set by allowing Alcaster to easily maintain enough mana to recast his spells, making him a very strong anti-caster hero who can sap mana from enemies quickly and effectively.
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