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Lt. Commander
Join Date: Dec 2007
Posts: 120
# 6
02-04-2010, 01:42 AM
Skills Tier 1 and Tier 2 have different slots and are leveled seperate. In the end you could have High Yield I and II

All skills have somewhere a shared cooldown. If you use High Yield I then you have a small global cooldown but right after this you could use High Yield II while the skill cooldown of High Yield I is still going down.

If you exchange a Tier I skill against another it seems that you get those spend points back as far as i have seen.