Shield Oath makes Sheltron useless.

[Duelle]

spam

PLD did not need a resource bar
PLD did not need a resource bar
PLD did not need a resource bar
PLD did not need a resource bar
PLD did not need a resource bar
PLD did not need a resource bar
PLD did not need a resource bar
PLD did not need a resource bar
PLD did not need a resource bar

See? I can do it too.

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I think the OP underlines the problem with creating a resource bar but making resources generate very slowly while under Shield Oath. I'll add that Holy Spirit should not generate 20 Oath under Shield Oath, since that forces the design to funnel Oath generation behind that spell to get people to use Holy Spirit on top of focusing on recovering MP (to cast Holy Spirit some more).

I'd probably nerf Oath generation from Holy Spirit, change Shield Oath to generate Oath when you take direct hits (blocks and parries would generate slightly more Oath), along with more Oath consumption from other skills to compensate.