Ley Wanderer 2014
CR 7 aberration
Huge aberration, neutral
Senses magic within 120' of it at will. This otherwise works like the detect magic spell but isn’t itself magical.
Bonus Actions
Drains the magic from an item it is holding. Magic item with charges loses 1d6 charges item with limited uses per day loses one daily use and single-use item such as potion or spell scroll is destroyed. All other magic items have their effects suppressed for 1 min. Wanderer gains 5 temp hp each time it drains a magic item. A drained item regains its magic after 24 hrs.
Reactions
When a creature wanderer can see within 30' of it casts spell wanderer can absorb spell's energy countering it. Works like counterspell except wanderer must always make spellcasting ability check no matter spell's level. Its ability check for this is +7. If it successfully counters the spell it gains 5 temp hp/spell level.
Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details