Giant's Causeway

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how do i get the bonus ability onto my units

[arakiel]

Move onto an adjacent hex. You'll see a Spear of Fionn notification, though your unit info does not appear to show the actual upgrade. Just select the unit and then hover over an enemy unit to confirm that your unit has the +5.

[The Reluctant Geek]

It stops giving the bonus sometimes. I always assumed it was because it's only active in ancient/classical times

[SirUlrichVL]

It is active in any era, just confirmed this by sending an Infantry unit whilst I am in the Modern era next to it to get the buff. Interestingly this was my original warrior upgraded whom had already got the buff. But having hovered over a city state unit with him upgraded I noticed it wasn't showing the buff no more, so I sent the infantry unit back to the wonder and it gained the buff again. I also gained it for first time with some bombards that I'd not previously sent to get the buff. One thing that I thought odd and maybe a bug or just maybe to ensure they aren't even more OP than they already are, my War-Carts didn't seem to be granted the buff but when upgraded to Knights they were able to