I haven't found any place can spend the EN....

why not sink ships 100 times only, i found it suddenly when i have combat LV 12+.

then maens, I sink much of pirate but it haven't growth up.

So funny on NPC auto RAM you then sink.

The calculation just count the last hit either Artillery or not, why not count on the each sink on Artillery or not?

who will land search 1000 times in this moment?

It doesn't count with land explorer...look like an *****