Companion Level XP Requirements:
At each level where you unlock a selectable modifier, there is a small chance the selection becomes a Spell instead of a passive modifier (the spell replaces that pick for that level).
Level 10 makes the companion a party leader and grants a guaranteed legendary.
From Level 11+ each level continues to add +1 selectable modifier, +1 party slot, and +1 attribute (all cumulative).
These are the XP-Requirements for the Level 2-99:
XP Table:
| Level | Total XP Needed | XP to Next Level |
|---|---|---|
| 2 | 25,000 | 25,000 |
| 3 | 50,000 | 50,000 |
| 4 | 100,000 | 50,000 |
| 5 | 150,000 | 100,000 |
| 6 | 250,000 | 100,000 |
| 7 | 350,000 | 100,000 |
| 8 | 450,000 | 100,000 |
| 9 | 550,000 | 250,000 |
| 10 | 800,000 | 100,000 |
| 11 | 900,000 | 100,000 |
| 12 | 1,000,000 | 100,000 |
| 13 | 1,100,000 | 100,000 |
| 14 | 1,200,000 | 100,000 |
| 15 | 1,300,000 | 100,000 |
| 16 | 1,400,000 | 100,000 |
| 17 | 1,500,000 | 100,000 |
| 18 | 1,600,000 | 100,000 |
| 19 | 1,700,000 | 100,000 |
| 20 | 1,800,000 | 200,000 |
| 21 | 2,000,000 | 200,000 |
| 22 | 2,200,000 | 200,000 |
| 23 | 2,400,000 | 200,000 |
| 24 | 2,600,000 | 200,000 |
| 25 | 2,800,000 | 200,000 |
| 26 | 3,000,000 | 200,000 |
| 27 | 3,200,000 | 200,000 |
| 28 | 3,400,000 | 200,000 |
| 29 | 3,600,000 | 200,000 |
| 30 | 3,800,000 | 200,000 |
| 31 | 4,000,000 | 200,000 |
| 32 | 4,200,000 | 200,000 |
| 33 | 4,400,000 | 200,000 |
| 34 | 4,600,000 | 200,000 |
| 35 | 4,800,000 | 200,000 |
| 36 | 5,000,000 | 200,000 |
| 37 | 5,200,000 | 200,000 |
| 38 | 5,400,000 | 200,000 |
| 39 | 5,600,000 | 200,000 |
| 40 | 5,800,000 | 200,000 |
| 41 | 6,000,000 | 200,000 |
| 42 | 6,200,000 | 200,000 |
| 43 | 6,400,000 | 200,000 |
| 44 | 6,600,000 | 200,000 |
| 45 | 6,800,000 | 200,000 |
| 46 | 7,000,000 | 200,000 |
| 47 | 7,200,000 | 200,000 |
| 48 | 7,400,000 | 200,000 |
| 49 | 7,600,000 | 200,000 |
| 50 | 7,800,000 | 200,000 |
| 51 | 8,000,000 | 200,000 |
| 52 | 8,200,000 | 200,000 |
| 53 | 8,400,000 | 200,000 |
| 54 | 8,600,000 | 200,000 |
| 55 | 8,800,000 | 200,000 |
| 56 | 9,000,000 | 200,000 |
| 57 | 9,200,000 | 200,000 |
| 58 | 9,400,000 | 200,000 |
| 59 | 9,600,000 | 200,000 |
| 60 | 9,800,000 | 200,000 |
| 61 | 10,000,000 | 200,000 |
| 62 | 10,200,000 | 200,000 |
| 63 | 10,400,000 | 200,000 |
| 64 | 10,600,000 | 200,000 |
| 65 | 10,800,000 | 200,000 |
| 66 | 11,000,000 | 200,000 |
| 67 | 11,200,000 | 200,000 |
| 68 | 11,400,000 | 200,000 |
| 69 | 11,600,000 | 200,000 |
| 70 | 11,800,000 | 200,000 |
| 71 | 12,000,000 | 200,000 |
| 72 | 12,200,000 | 200,000 |
| 73 | 12,400,000 | 200,000 |
| 74 | 12,600,000 | 200,000 |
| 75 | 12,800,000 | 200,000 |
| 76 | 13,000,000 | 200,000 |
| 77 | 13,200,000 | 200,000 |
| 78 | 13,400,000 | 200,000 |
| 79 | 13,600,000 | 200,000 |
| 80 | 13,800,000 | 200,000 |
| 81 | 14,000,000 | 200,000 |
| 82 | 14,200,000 | 200,000 |
| 83 | 14,400,000 | 200,000 |
| 84 | 14,600,000 | 200,000 |
| 85 | 14,800,000 | 200,000 |
| 86 | 15,000,000 | 200,000 |
| 87 | 15,200,000 | 200,000 |
| 88 | 15,400,000 | 200,000 |
| 89 | 15,600,000 | 200,000 |
| 90 | 15,800,000 | 200,000 |
| 91 | 16,000,000 | 200,000 |
| 92 | 16,200,000 | 200,000 |
| 93 | 16,400,000 | 200,000 |
| 94 | 16,600,000 | 200,000 |
| 95 | 16,800,000 | 200,000 |
| 96 | 17,000,000 | 200,000 |
| 97 | 17,200,000 | 200,000 |
| 98 | 17,400,000 | 200,000 |
| 99 | 17,600,000 | — |