Thats because you cant use the skill itself but when its ready it'll get triggered automaticly if you use ur Elemental Catalysis.
Actually, my mistake. I was confused by the colour of the skill description indicating that it could still be used by clicking on it.
I think it would be a good idea to change the colour scheme of the descriptions then, to the same as on passive skills .
Afaik passive skills can only have hidden buff cooldowns, guess that's why it's an active unclickable skill now... which is fine to me...
...But I'd suggest to have the 6 min CD changed to something scaling on Elemental Catalysis actual cooldown, since there are different cooldowns versions around. M/B and M/S got 3m while others got 4m. So 6m (360s) CD for all mages seems not to be fair at all
Solution:
Better give the ISS 100% of the catalysis reduction plus 50% additionally. This would result in (240*0.75*1.5) 270s ISS CD for 4m Catalysis and (180*0.75*1.5) 202.5s ISS CD for 3m Catalysis