Death Lock.
This was the first Death Element skill that Aaron was able to find, instead of inheriting from increasing his rank.
All this time, whatever Death-related skills he had came from increasing his rank from Rank-0 to Rank-2. Other than this way, he had no other way to get the Death Skills.
Now he spotted a Death Skill, no matter what, he wanted to get the skill and when he saw the details of the skill, his fervour to get the skill by any chance increased.
--
Death Lock (Rank 0): Lock onto any target within 5 meters, without alerting the target as long as they are not higher rank than you. Once locked, the target can't escape the next attack as long as they don't exceed 15 meters. The range increases with an increase in the rank of the skill.
[Note: Even common detection skills can't detect them.]
--