Light Insect Dragon brought some boring skills ups with it, but it still seemed worth it to skill up Rei Sirius.
My first Rei Sirius was horrendous, going 4/33 or 12.1%, but my second one went 4/10 which was quite nice. I got quite lucky with my Indra skills ups, but since he’s a fairly low priority and I need to save stones for Pandora skill ups I’m leaving him at level 4. I do see him being used in some high level players’ videos though — for the damage reduction and/or skill bind resist — so I may eventually max him.
My current skill up rate is 365/1917 or 19.04%. Whenever I seem to be making progress towards 20%, I always get a string of 0-fers to bring me back down below 19%.