Lvl	FP	Duration (Secs)
1	22	4.0
2	22	4.5
3	23	5.0
4	23	5.5
5	24	6.0
6	24	6.5
7	25	7.0
8	25	7.5
9	25	8.0
10	27	8.5
11	27	9.0
12	27	9.5
13	28	10.0
14	29	10.5
15	30	11.0
16	31	11.5
17	31	12.0
18	32	12.5
19	32	13.0
20	35	14.0

Becoming invisible for a short duration.