Keeper's Lantern fires when you clear a room. On Eternal Hearthstone Relic it reads: Clearing a room restores 12% of your maximum health.
Word for word it is Clearing a room restores {value}% of your maximum health, and the number in it grows with the gear: 8 to start, 0.5 more for every item level.
2 bases carry it, and 2 Uniques are built on those: Last Keeper's Lantern and The Evensong.
Awakening can reach it too — 14 spirit paths pick it up at Spirit Level 3: Pyrewarden, Winterwarden, Galewarden, Abysswarden, Sunwarden and Rubywarden and 8 more.
Gear that carries it
2 bases
| Base | Slot | Value | iLvl | Found in | |
|---|---|---|---|---|---|
 | Eternal Hearthstone Relic | Relic | 12 | 80 | DEMON |
 | Eternal Lantern Parade Relic | Relic | 15 | 80 | NIGHTMARE |
Uniques
2 Uniques
Spirit paths that reach it
14 paths · value at each Spirit Level
| Path | Family | Affinity | L3 | L4 | L5 |
|---|---|---|---|---|---|
| Pyrewarden | Staff | Fire | 6 | 10 | 16 |
| Winterwarden | Staff | Frost | 6 | 10 | 16 |
| Galewarden | Staff | Storm | 6 | 10 | 16 |
| Abysswarden | Staff | Void | 6 | 10 | 16 |
| Sunwarden | Staff | Holy | 6 | 10 | 16 |
| Rubywarden | Staff | Blood | 6 | 10 | 16 |
| Sporewarden | Staff | Poison | 6 | 10 | 16 |
| Boulderwarden | Staff | Stone | 6 | 10 | 16 |
| Sunpsalm | Tome | Holy | 6 | 10 | 16 |
| Auroraaegis | Shield | Holy | 6 | 10 | 16 |
| Dawncrown | Helm | Holy | 6 | 10 | 16 |
| Lumenplate | Armor | Holy | 6 | 10 | 16 |
| Aurorastep | Boots | Holy | 6 | 10 | 16 |
| Halovow | Relic | Holy | 6 | 10 | 16 |