Could someone give me quick tips for summoner?

I guess you could cast Bio while the tank is pulling more monsters during a speedrun since it's instant.
Applying Miasma before Bio II can be worthwile while soloing, to apply the disease/decreased movement speed debuff.

A little trick I use if I have to run around say ifrit eruptions or if I am on Bombs in CT KB. Bio > Energy drain > Ruin II its my on the move go to.

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Originally Posted by Judge_Xero

since you can't issue a command while casting.

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False. You can.