Talk:Serration/@comment-99.247.32.68-20131126195835/@comment-82.66.246.250-20131128102440

By my calculations using uncommon cores is as efficient as using same polarity and rarity mods and using rare cores is the most efficient. I'm talking credits per mod point efficiency. So basically you just wasted 400k there because common mods yield around 1 mod point per 150 credits whereas uncommon ones around 1 mod point per 75 credits (the double).

English: common cores are better then same polarity common mods for a common mod fusion. Uncommon cores (especially 5) are better then same polarity uncommon mods for an uncommon mod fusion (or an common mod fusion) and are also better then using regular rare mods. Rare cores are just the best, giving most mod powers and using the least credits.

This all is due to the fact that cores are [rarity](0-10) so it always is more efficient even though at first glace it looks as if cores cost more to use.

Rule of thumb: use as many cores as possible when you don't have duplicates. Uncommon and rares can do the trick as well (same polarity of course, see fusion wiki page) but are better kept for other things: transmutation, trade, other builds. Only use common mods to complete a current fusion (as when only a few points remain and using higher stuff would be just wasting points).