This actually deals quite a lot of damage and is a perfectly viable and fun way to play the game.
The "class" is best starting from mech bosses up until plantera.
best upside: No mana potions needed so it has no damage falloff unlike normal mage (I actually consider this better than normal mage) and its a refreshing playstyle, also you can use flasks so you can inflict ichor very easily
Downside: you need at least 3 weapons (one magic, one whip and one summon) and the forbidden set and you have to play the old one's army for the apprentice leggings (forbidden is fine too tho) You also need both summoning and magic potions.
Strategy: Use your magic weapon (meteor or venom staff because mana cost doesnt really matter here) until you run out of mana, then switch to the whip. When the mana recharges, repeat. Dont use emblems pre-plantera since half your damage is magic, half is summon.
by StatisticianPure2804